Affirmed by published opinion. Judge WILLIAMS wrote the majority opinion, in which Judge SHEDD joined. Judge KING wrote a separate opinion dissenting in part.
WILLIAMS, Circuit Judge.
Marcus Reymond Robinson, a North Carolina death-row inmate, appeals the district court’s denial of his habeas petition filed under 28 U.S.C.A. § 2254 (West 1994 & Supp.2005). We granted a certificate of appealability to consider two claims raised by Robinson: (1) that the trial court’s jury instructions during the guilt phase of his trial violated the Eighth Amendment; and (2) that a juror’s recitation of a Biblical passage during sentencing deliberations violated the Sixth Amendment. Applying the deferential standard of review required by the Antiterrorism and Effective Death Penalty Act of 1996 (AEDPA), we conclude that the North Carolina court’s decision denying Robinson relief on these claims was not an unreasonable application of clearly established federal law. Accordingly, we deny Robinson’s petition and his request for an evidentiary hearing on his Bible claim.
I.
The facts are set forth adequately in the order of the North Carolina Superior Court (MAR court) denying Robinson’s motion for appropriate relief (MAR):
The State’s evidence at trial tended to show that on the morning of 21 July 1991, seventeen year old Erik Tornblom did not return home from Chi Chi’s restaurant, where he was employed. Erik was a rising senior at Douglas Byrd High School and worked at Chi Chi’s from appropriately [sic] 6:00 pm until midnight. His body was discovered later that day, having been shot in the face with a shotgun. A witness testified at trial that he observed a black male drive Erik’s car to the location where it was later recovered, get out of the vehicle and wipe off the steering wheel and door handle. The black male identified, [sic] as Roderick Williams, was thereafter arrested and named [Robinson] as the person involved with him in the murder of Erik Tornblom.
[Robinson] was thereafter taken into custody and properly advised of his Mi[353]*353randa rights, which he waived. After initially denying any involvement in the murder, [Robinson] admitted that he and Williams had watched Erik Torn-blom enter a store. While Tornblom was in the store, [Robinson] pulled out a sawed-off shotgun, which had been concealed in his clothes, and gave it to Williams. As the victim left the store, [Robinson] and Williams asked for a ride. As soon as they entered the car, Williams put the gun to the back of Erik. Tornblom’s neck and forced him to drive to a location that [Robinson] and Williams ordered. In his confession, [Robinson] stated that “[t]he boy kept begging and pleading for us not to hurt him, because he didn’t have any money.” After ordering [Tornblom] out of the car, he was made to lie down. According to [Robinson], Williams then, shot [Tornblom] in the face with the shotgun. [Robinson] then took [Tornblom]’s wallet and split the money with Williams. [Robinson] led police to where he had hidden the shotgun and also showed them where the spent shotgun shell was ejected. Both the gun and the spent shell were recovered by the police.
Other evidence tended to show, two days prior to the murder, that [Robinson] told Williams’ aunt that “he was going to burn him a whitey”. [sic] On the morning of the murder, [Robinson] obtained the shotgun from a friend, who heard [Robinson] tell Williams that he wanted to rob a Quik Stop or “do” a white boy. After the murder, [Robinson] told a Mend that he had robbed a guy the night before and shot him in the head.
(J.A. at 386-388.) At the time of these events, Robinson had just turned eighteen years old and only eleven days earlier had been released from prison.
Robinson and Williams were indicted by a North Carolina jury on August 5, 1991, and charged with one count of first-degree murder, one count of first-degree kidnap-ing, one count of robbery with a dangerous weapon, once count of possession of a weapon of mass destruction, one count of felonious larceny, and one count of possession of a stolen vehicle. As Robinson admits,
[at voir dire,] the prosecutor ensured that every member of the venire thoroughly revealed his or her religious preferences regarding ... application of the death penalty. Moreover, each potential juror was required to unequivocally state that their religious beliefs would not interfere with their individual and collective duty to vote on the ... sentencing phase[ ].
(J.A. at 438.)
Robinson’s trial began on July 13, 1994. On the second day of trial, Robinson pleaded guilty to all of the offenses except for the first-degree murder charge. That charge was tried to the jury on two different theories: felony murder and murder with malice, deliberation, and premeditation (premeditated murder). The jury convicted Robinson, by special verdict, of first-degree murder under each theory.1
During the sentencing phase of the trial, the jury heard evidence relating to circumstances that both aggravated and mitigated the extent of Robinson’s culpability in the crime. At the outset of its charge to the jury, the trial court emphasized to them that “[i]t is absolutely necessary that you understand and apply the law as I give it to you, and not as you think it is or might [354]*354like it to be.” (J.A. at 213.) To guide the jury’s consideration of the evidence presented, the trial court provided the jury with a form entitled “Issues and Recommendation as to Punishment,” which consisted of a written list of two possible aggravating circumstances and twenty possible mitigating circumstances, and instructed the jury how to apply the law to each of these circumstances. (J.A. at 215— 247.) The jury completed the form, finding both of the aggravating circumstances but only six of the mitigating circumstances.2 The jury ultimately concluded that the aggravating circumstances outweighed the mitigating circumstances and unanimously recommended that Robinson be sentenced to death.3
Robinson’s conviction and sentence were affirmed on direct appeal by a unanimous North Carolina Supreme Court. State v. Robinson, 342 N.C. 74, 463 S.E.2d 218 (1995). The United States Supreme Court thereafter denied certiorari review. Robinson v. North Carolina, 517 U.S. 1197, 116 S.Ct. 1693, 134 L.Ed.2d 793 (1996).
On November 1, 1996, Robinson filed his MAR. Following an evidentiary hearing on some of his claims,4 the MAR court denied Robinson relief on all of his claims. The North Carolina Supreme Court denied discretionary review of the MAR court’s ruling. State v. Robinson, 350 N.C. 847, 539 S.E.2d 646 (1999).
On February 28, 2000, Robinson filed the instant § 2254 petition in the United States District Court for the Eastern District of North Carolina raising thirteen claims of constitutional error. The State moved for summary judgment on Robinson’s petition, and on September 7, 2004, the district court denied Robinson’s request for an evidentiary hearing and granted the State’s motion for summary judgment. On February 28, 2005, the district court entered an order denying Robinson a certificate of appealability on all of his claims. We granted Robinson’s timely petition for a certificate of appealability on two issues: whether the MAR court erred in failing to grant him relief on (1) his claim that his death sentence violated the Eighth Amendment and (2) his claim that the presence of a Bible during jury deliberations violated the Sixth Amendment.
II.
We review de novo the district court’s decision to deny a § 2254 petition based on the record before the MAR court, applying the same standards as the district court. Whittlesey v. Conroy, 301 F.3d 213, 216 (4th Cir.2002). Pursuant to AEDPA, the scope of federal review is highly constrained. We may grant a petition with respect to any claim adjudicated on the merits in state court only if the state court decision was either contrary to, or an un[355]*355reasonable application of, clearly established federal law as determined by the Supreme Court. 28 U.S.C.A. § 2254(d)(1).
A decision of a state court is contrary to clearly established federal law “if the state court arrives at a conclusion opposite to that reached by [the Supreme] Court on a question of law or if the state court decides a case differently than [the Supreme] Court has on a set of materially indistinguishable facts.” (Terry) Williams v. Taylor, 529 U.S. 362, 413, 120 S.Ct. 1495, 146 L.Ed.2d 389 (2000). A state court adjudication is an unreasonable application of federal law when the state court “correctly identifies the governing legal rule [from the Supreme Court’s cases] but applies it unreasonably to the facts of a particular ... case,” id. at 407-08, 120 S.Ct. 1495, or “applies a precedent in a context different from the one in which the precedent was decided and one to which extension of the legal principle of the precedent is not reasonable [or] fails to apply the principle of a precedent in a context where such failure is unreasonable,” Green v. French, 143 F.3d 865, 870 (4th Cir.1998), overruled on other grounds by (Terry) Williams, 529 U.S. 362, 120 S.Ct. 1495, 146 L.Ed.2d 389; see also Oken v. Corcoran, 220 F.3d 259, 263 n. 3 (4th Cir.2000) (noting that “the [Supreme Court in (Terry) Williams left] open the question of whether” Green's definition of the “unreasonable application” was correct). The state court’s application of clearly established federal law must be “objectively unreasonable,” and “a federal habeas court may not issue the writ simply because that court concludes in its independent judgment that the relevant state-court decision applied clearly established federal law erroneously or incorrectly.” (Terry) Williams, 529 U.S. at 411, 120 S.Ct. 1495. The phrase “clearly established law” refers “to the holdings, as opposed to the dicta, of [the Supreme] Court’s decisions as of the time of the relevant state-court decision.” Id. at 412, 120 S.Ct. 1495. Robinson argues that the MAR court’s decision on the Eighth and Sixth Amendment issues was an unreasonable application of clearly established law.5 We examine these claims in turn.
A.
Robinson’s first argument is that his death sentence was imposed in violation of his Eighth Amendment right as established by Enmund v. Florida, 458 U.S. 782, 102 S.Ct. 3368, 73 L.Ed.2d 1140 (1982). In Enmund, the defendant was the getaway driver in a robbery that resulted in death. Id. at 784, 102 S.Ct. 3368. Based solely on his participation in aiding and abetting the robbery, he was convicted of first-degree murder and sentenced to death. Id. at 785, 102 S.Ct. 3368. The Supreme Court reversed his death sentence, holding that the Eighth Amendment prohibits imposing the death penalty on a defendant “who aids and abets a felony in the course of which a murder is committed by others but who does not himself kill, attempt to kill, or intend that a killing take place or that lethal force will be employed.” Id. at 797, 102 S.Ct. 3368.
Robinson contends that under the trial court’s jury instructions, the jury was not required to find either that he killed or intended to kill Tornblom in order to convict him of first-degree murder and that, as a result, his death sentence violates Enmund. The MAR court rejected this argument on the merits, and we conclude that the MAR court’s decision was not an [356]*356unreasonable application of Enmund. In fact, the trial court’s instructions required the jury to find both that Robinson killed Tornblom and that he intended his death to occur.
As noted, Robinson was tried on theories of premeditated murder and felony murder. Addressing premeditated murder first, the trial court charged that
the State must prove ... that [Robinson] intentionally and with malice killed [Tornblom] with a deadly weapon .... that [Robinson’s] act was a proximate cause of [Tornblom’s] death .... that [Robinson] intended to kill [Tornblom] .... that [Robinson] acted after premeditation .... [and] that [Robinson] acted with deliberation.
(J.A. at 115.) This charge clearly required the jury to find that Robinson killed Torn-blom and intended his death to occur in order to convict him for premeditated murder.
Robinson argues, however, that the trial court’s felony murder charge, which followed, created an ambiguity in the premeditated murder charge. After setting forth the elements of felony murder,6 the trial court gave the following instruction:
Ladies and gentlemen of the jury, for a person to be guilty of a crime, it is not necessary that he himself do all of the acts necessary to constitute the crime. If two or more persons act together with a common purpose to commit robbery with a firearm and are actually or constructively present at the time the crime is committed, each of them is held responsible for the acts of the others done in the commission of robbery with a firearm.
(J.A. at 118.) Robinson contends that this “acting-in-concert” instruction failed to differentiate between felony murder and premeditated murder such that he could have been convicted of the latter even if the jury believed that Williams killed Torn-blom and that he (Robinson) lacked the requisite intent.
We disagree. The trial court’s felony murder and premeditated murder charges were separate and distinct from one another, and the elements of each offense were clearly delineated. Moreover, by its own terms the acting-in-concert charge did not apply to the premeditated murder charge. Instead, by referring to the legal effect of the joint commission of a “robbery with a firearm,” (J.A. at 118), the acting-in-concert charge was explicitly linked only to the felony murder theory.
If this were not enough, immediately after giving the acting-in-concert instruction, the trial court summarized the requirements for both theories of murder:
So I charge that if you find from the evidence beyond a reasonable doubt that on or about the alleged date the defendant intentionally killed the victim with a deadly weapon and that this proximately caused the victim’s death and that the defendant intended to kill the victim and that he acted with malice, after premeditation and with deliberation, it would be your duty to return a verdict of guilty of first degree murder on the basis of malice, premeditation, and deliberation.
However, if you do not so find or have a reasonable doubt as to one or more of these things, you would not return a [357]*357verdict of guilty of first degree murder on the basis of malice, premeditation, and deliberation.
Whether or not you find the defendant guilty of first degree murder on the basis of malice, premeditation, and deliberation, you will also consider whether he is guilty of first degree murder under the first degree felony murder rule.
So I charge that if you find from the evidence beyond a reasonable doubt that on or about the alleged date the defendant, acting either by himself or acting together with Roderick Williams, had in his possession a firearm and took and carried away property from the person or presence of a person without his voluntary consent by endangering or threatening another person’s life with the use or threatened use of a firearm, the defendant knowing that he was not entitled to take the property and intending to deprive him of its use permanently and while committing or attempting to commit robbery with a firearm the defendant killed the victim and the defendant’s act was a proximate cause of the victim’s death, it would be your duty to return a verdict of guilty of first degree murder under the felony murder rule.
(J.A. at 119-120 (emphases added).)
In this summation, the court reaffirmed that the acting-in-concert instruction applied only to felony murder by charging that Robinson could be found guilty of premeditated murder only if Robinson “killed” and “intended to MU” Tornblom. (J.A. at 119.) Moreover, by charging in the summation that the jury could convict Robinson of felony murder if it found that he “aet[ed] either by himself or aet[ed] together with [Williams]” to commit robbery with a firearm, the trial court again expressly linked and limited the acting-in-concert instruction to the felony murder charge. (J.A. at 119.) The summation reaffirmed that the jury could find Robinson guilty of premeditated murder only if it found that he killed Tornblom and intended his death to occur. Because the trial court’s instruction required the jury to make these findings, the MAR court did not unreasonably apply Enmund in denying Robinson’s Eighth Amendment claim.7
B.
1.
Robinson’s second argument is based on two subparts: (1) that his death sentence was imposed in violation of his Sixth Amendment right of confrontation because the Bible amounted to evidence against him and (2) that his death sentence was imposed in violation of his Sixth Amendment right to impartial sentencing deliberations because the Bible reading was an improper influence upon the jury. To support these contentions in the MAR court, Robinson presented the affidavits of two law students that summarized their conversations with two of the jurors in the case. Those affidavits state:
The [first] juror revealed that [a second] juror had asked for a bailiff to [358]*358bring in a bible during deliberation on sentencing. He recalled that the bailiff provided a bible, and the second juror read a passage concerning an “eye for an eye.” The one who requested the bible was citing to the scripture passage to attempt to convince other jurors, including the one we interviewed ... that they should change their position from one favoring a life sentence to one favoring a death sentence. The bible passage was read to the other jurors before the final vote for a death sentence....
[A third] juror corroborated the first juror’s statement, and confirmed the fact that the [second] juror had a bible during deliberations on sentencing, however the third juror could not recall whether the bailiff provided the bible, or whether the [second] juror had brought it into the deliberations. The third juror ... remembered the [second] juror quoting scriptures during sentencing, but did not remember the specific passage quoted.
(J.A. at 283-84.)
Robinson also argued that he could produce four jurors who were willing to testify to these facts at an evidentiary hearing. The MAR court denied the Bible claim without an evidentiary hearing, stating that “there is insufficient evidence to require an evidentiary hearing on the issue, even taking the submitted materials in the light most favorable to [Robinson].” (J.A. at 428.) The MAR court held “that the alleged Bible reading, if it occurred, [was] not extraneous, prejudicial information” as required under North Carolina law to permit the impeachment of a jury verdict. (J.A. at 428 (internal quotation marks omitted).)
Robinson conceded in his habeas petition that “the [MAR] court denied [his Sixth Amendment] claim on the merits,” (J.A. at 437), and he does not now argue otherwise. We therefore subject this claim, as we did his Eighth Amendment claim, to AEDPA’s deferential standard of review. See Bell v. Jarvis, 236 F.3d 149, 158 (4th Cir.2000) (en banc) (holding that a state court decision denying petitioner post-conviction relief “[on] the merits ... must be reviewed under the deferential provisions of § 2254(d)(1)”). To satisfy this standard, AEDPA “does not require citation of [Supreme Court] cases — indeed, it does not even require awareness of [those] cases.” Early v. Packer, 537 U.S. 3, 8, 123 S.Ct. 362, 154 L.Ed.2d 263 (2002) (emphasis in original). “In assessing the reasonableness of the state court’s application of federal law, [therefore,] the federal courts are to review the result that the state court reached, not ‘whether [its decision] [was] well reasoned.’ ” Wilson v. Ozmint, 352 F.3d 847, 855 (4th Cir.2003) (quoting Bell, 236 F.3d at 159; Wright v. Angelone, 151 F.3d 151, 157 (4th Cir.1998); and Hennon v. Cooper, 109 F.3d 330, 335 (7th Cir.1997))(alterations in original and emphasis added).
In examining the merits of Robinson’s claim, we, like the MAR court, will assume the factual allegations set forth in the law students’ affidavits are true. See Bacon v. Lee, 225 F.3d 470, 485 (4th Cir.2000) (assuming on federal review the truth and admissibility of petitioners factual allegations where the MAR court denied an evi-dentiary hearing on the claim). These affidavits allege the following: (1) a juror asked for, and the bailiff provided, a Bible during sentencing deliberations; (2) the juror read an “eye for an eye” passage;8 [359]*359(3) the passage was read to the other jurors before a final vote on a death sentence; and (4) the juror read the passage in an attempt to convince his fellow jurors to vote for a death sentence.
The Sixth Amendment provides, in relevant part, that “the accused shall enjoy the right to a ... trial[ ] by an impartial jury ... [and to] be confronted with the witnesses against him.” U.S. Const, amend VI. The right to trial by an impartial jury “guarantees ... a fair trial by a panel of impartial, indifferent jurors.” Irvin v. Dowd, 366 U.S. 717, 722, 81 S.Ct. 1639, 6 L.Ed.2d 751 (1961). This right prohibits “any private communication, contact, or tampering directly or indirectly, with a juror during trial about the matter pending before the jury.” Remmer v. United States, 347 U.S. 227, 229, 74 S.Ct. 450, 98 L.Ed. 654 (1954). The right of confrontation requires that the “jury’s verdict must be based upon the evidence developed at the trial.” Turner v. Louisiana, 379 U.S. 466, 472, 85 S.Ct. 546, 13 L.Ed.2d 424 (1965). In addition, it “necessarily implies at the very least that the evidence developed against a defendant shall come from the witness stand in a public courtroom where there is full judicial protection of the defendant’s right[s].” Id. at 472, 85 S.Ct. 546 (internal quotation marks omitted). These rights apply equally to sentencing proceedings tried to a jury. See Morgan v. Illinois, 504 U.S. 719, 727-28, 112 S.Ct. 2222, 119 L.Ed.2d 492 (1992).
Despite these venerable protections afforded to criminal defendants, the Sixth Amendment does not require that all evidence introduced by the defendant tending to impeach the-jury’s verdict be considered by the courts. See Tanner v. United States, 483 U.S. 107, 117, 107 S.Ct. 2739, 97 L.Ed.2d 90 (1987). In fact, the common-law rule generally “prohibited the admission of juror testimony to impeach a jury verdict.” Id. at 117, 107 S.Ct. 2739. The Supreme Court explained the justification for this rule in McDonald v. Pless, 238 U.S. 264, 35 S.Ct. 783, 59 L.Ed. 1300 (1915), decided early last century:
[L]et it once be established that verdicts solemnly made and publicly returned into court can be attacked and set aside on the testimony of those who took part in their publication and all verdicts could be, and many would be, followed by an inquiry in the hope of discovering something which might invalidate the finding. Jurors would be harassed and beset by the defeated party in an effort to secure from them evidence of facts which might establish misconduct sufficient to set aside a verdict. If evidence thus secured could be thus used, the result would be to make what was intended to be a private deliberation, the constant subject of public investigation; to the destruction of all frankness and freedom of discussion and conference.
Id. at 267-68, 35 S.Ct. 783.9 This common-law rule has been codified in Fed.R.Evid. [360]*360606(b) and in many states’ rules of evidence, including North Carolina’s.10
Like the common law, the Federal Rules of Evidence and the North Carolina Rules of Evidence contain an exception to this general rule when “extraneous prejudicial information” is improperly brought to the jury’s attention or when an “outside influence [is] improperly brought to bear upon any juror.” Fed.R.Evid. 606(b); N.C. Gen.Stat. § 8C-1, Rule 606(b) (2003); see also Tanner, 483 U.S. at 117, 107 S.Ct. 2739 (describing exceptions to the common-law rule excluding juror testimony).11
These exceptions track the Sixth Amendment protections embodied in the Confrontation and Impartial Jury Clauses. First, the exception for extraneous prejudicial information allows the court to consider juror allegations that the defendant’s rights to confrontation were violated. In Parker v. Gladden, 385 U.S. 363, 87 S.Ct. 468, 17 L.Ed.2d 420 (1966), for example, the defense attorney, after speaking with jurors, prepared an affidavit alleging that
a court bailiff assigned to shepherd the sequestered jury, which sat for eight days, stated to one of the jurors in the presence of others while the jury was out walking on a public sidewalk: “Oh that wicked fellow [petitioner], he is guilty”; and on another occasion said to another juror under similar circumstances, “If there is anything wrong [in finding petitioner guilty] the Supreme Court will correct it.”
385 U.S. at 363-64, 87 S.Ct. 468. Despite the fact the affidavit was based on juror’s testimony, the Supreme Court did not discuss whether the affidavit was admissible. Instead, it simply accepted the evidence and concluded that the bailiffs statements were tantamount to testimoni[361]*361al evidence, and, because they were not made on the witness stand at trial, the defendant was denied his constitutional right of confrontation. Id. at 364, 87 S.Ct. 468 (“We have followed the undeviating rule that the rights of confrontation and cross-examination are among the fundamental requirements of a constitutionally fair trial.” (internal quotation marks and citations omitted)).
Similarly, in Turner v. Louisiana, 379 U.S. 466, 85 S.Ct. 546, 13 L.Ed.2d 424 (1965), two deputy sheriffs who were key prosecution witnesses were also responsible for the sequestration of the jury during the defendant’s trial. Id. at 467-468, 85 S.Ct. 546. These deputies “ate with [the jury], conversed with them, and did errands for them.” Id. at 468, 85 S.Ct. 546. Without discussing the source of the evidence used to impeach the jury’s verdict, the Court declared that the Sixth Amendment’s right to a jury trial “necessarily implies at the very least that the evidence developed against a defendant shall come from the witness stand in a public courtroom where there is full judicial protection of the defendant’s rightfs].” Id. at 472-73, 85 S.Ct. 546 (internal quotation marks omitted). The deputy sheriffs’ association with the jury risked that the jurors would make their determinations about the deputy sheriffs’ trustworthiness outside of the courtroom, thus eliminating Turner’s ability to cross-examine the deputy sheriffs effectively and tainting the jury’s ability to weigh the evidence neutrally. Id. at 473, 85 S.Ct. 546. The Court concluded that “it would be blinking reality not to recognize the extreme prejudice inherent in this continual association throughout the trial between the jurors and these two key witnesses for the prosecution.” Id. at 473, 85 S.Ct. 546.
The exception to the exclusionary rule for outside influences, on the other hand, protects a defendant’s right to an impartial jury. In Remmer v. United States, 347 U.S. 227, 74 S.Ct. 450, 98 L.Ed. 654 (1954), for example, an unnamed person attempted to bribe a juror. Id. at 228, 74 S.Ct. 450. Before the jury returned a verdict, the juror reported the incident to the judge, who informed the prosecutor, and the FBI was called in to investigate. Id. The defendant, however, was not informed of the.incident until after the trial. Id. The Supreme Court concluded that a hearing was reqüired to determine whether the bribe and thé FBI’s investigation involved “private communication, contact, or tampering ... with a juror,” thereby exerting an outside influence on the jury’s verdict, despite the fact the hearing would inevitably require the .jurors to testify as to their exposure to the bribe or the FBI’s investigation. Id. at 229-230, 74 S.Ct. 450.12
In contrast to Parker, Turner, and Remmer, which involved external influences upon a jury,13 is the line of Supreme Court cases involving an internal influence.14 In Tanner v. United States, [362]*362483 U.S. 107, 107 S.Ct. 2739, 97 L.Ed.2d 90 (1987), for example, the defendant sought an evidentiary hearing at which he proposed to examine jurors’ alleged drug and alcohol use during the trial. Id. at 117, 107 S.Ct. 2739. The Supreme Court refused to grant the defendant relief because, unlike Parker, Turner, and Remmer, a hearing would allow inquiry “into the internal processes of the jury.” Id. at 120, 107 S.Ct. 2739. Although the Supreme Court has never provided a formula for deciding whether a particular influence upon the jury was external or internal, it did cite approvingly to lower courts holding that the distinction turns not on whether the influence occurs inside or outside the jury room but is rather “based on the nature of the [influence].” Id. at 117, 107 S.Ct. 2739. In Tanner, the Supreme Court disagreed with the defendant’s argument that the Sixth Amendment compelled the district court to consider evidence of jurors’ intoxication, holding instead that other aspects of the trial process protect the defendant’s right to a jury free of internal influences upon the jury:
The suitability of an individual for the responsibility of jury service, of course, is examined during voir dire. Moreover, during trial the jury is observable by the court, by counsel, and by court personnel. Moreover, jurors are observable by [363]*363each other, and may report inappropriate juror behavior to the court before they render a verdict.
Id. at 127, 107 S.Ct. 2739 (internal citations omitted and emphasis in original).
Tanner thus establishes that the Sixth Amendment’s guarantees do not require judicial consideration of juror allegations regarding influences internal to the deliberation process. Under clearly established Supreme Court case law, an influence is not an internal one if it (1) is extraneous prejudicial information; i.e., information that was not admitted into evidence but nevertheless bears on a fact at issue in the case,15 see Parker, 385 U.S. at 364, 87 S.Ct. 468; Turner, 379 U.S. at 473, 85 S.Ct. 546, or (2) is an outside influence upon the partiality of the jury, such as “private communication, contact, or tampering ... with a juror,” Remmer, 347 U.S. at 229, 74 S.Ct. 450. Robinson has cited, and our research has unearthed, no Supreme Court case addressing whether allegations of Bible reading fall into either of these categories.
Although our answer could possibly be different on de novo review, we are satisfied that the MAR court did not unreasonably apply these principles in denying Robinson’s Bible-reading claim. First, contrary to Robinson’s suggestion and unlike the bailiffs statements in Parker and deputy sheriffs’ association with the jury in Turner, it would have been reasonable for the MAR court to conclude that the Bible had no bearing on any fact relevant to sentencing, and was therefore not tantamount to “evidence” that was used against him at sentencing. See Black’s Law Dictionary 595 (8th ed.2004) (defining “evidence” as “something ... that tends to prove or disprove the existence of an alleged fact”). In the end, the jury concluded that the balance of the aggravating and mitigating circumstances warranted imposing the death penalty. Unlike the facts at issue in Parker and Turner, no Biblical passage — including the ones we assume were read — had any evidentiary relevance to the jury’s determination of the existence of these aggravating and mitigating circumstances.16
Second, it would have been reasonable for the MAR court to conclude that the Bible is not analogous to a private communication, contact, or tampering with a juror, and that the common-law rule against allowing juror testimony applied. See Remmer, 347 U.S. at 229, 74 S.Ct. 450. Unlike these occurrences, which impose pressure upon a juror apart from the juror himself, the reading of Bible passages invites the listener to examine his or her own. conscience from within. In this way, [364]*364the Bible is not an “external” influence. In addition, reading the Bible is analogous to the situation where a juror quotes the Bible from memory, which assuredly would not be considered an improper influence. Cf. Tanner, 483 U.S. at 124, 107 S.Ct. 2739 (in holding that Fed.R.Evid. 606(b) does not violate the Sixth Amendment, noting that the Rule does not “open[] verdicts up to challenge on the basis of what happened during the jury’s internal deliberations, for example, where a juror alleges that the jury refused to follow the trial judge’s instructions or that some of the jurors did not take part in deliberations” (quoting S.Rep. No 93-1277, p. 13-14 (1974))); J.E.B. v. Alabama ex rel. T.B., 511 U.S. 127, 149, 114 S.Ct. 1419, 128 L.Ed.2d 89 (O’Connor, J., concurring) (“Jurors are not expected to come into the jury box and leave behind all that their human experience has taught them.” (internal quotation marks omitted)). We do not believe that the physical presence and reading of the Bible in the jury room required the MAR court to arrive at a different conclusion under clearly established Supreme Court case law. Moreover, like the alleged misconduct in Tanner, we believe that the MAR court reasonably could have concluded that the safeguards of the trial process — in particular, the facts that jurors’ religious views can be examined at voir dire, as they were in this case, and that the defendant can request a jury charge explaining to the jurors their duty to follow the law, as was given in this case — provide an adequate protection of a defendant’s right to be sentenced by a jury free of improper influences such that a post-verdict examination into Bible reading is unnecessary.
To be sure, the line between an “external” influence and an “internal” influence is a fine one, and one that may even blur upon close inspection. In a formalistic sense, the Bible itself is “external” to jurors, as is a private communication, contact, or tampering insofar as it is not a document physically within the jurors themselves. But then so too were the drugs and alcohol allegedly ingested in Tanner “external” in this sense of the word. In any event, formalistic analyses conflict with Tanner’s admonition that whether an influence is external or internal is not determined by rigid concepts, but by analyzing the “nature” of the influence. 483 U.S. at 117, 107 S.Ct. 2739. The difficulty in locating the line between Remmer and Tanner only confirms that the MAR court’s rejection of Robinson’s Bible claim was not an unreasonable application of clearly established law. See Mitchell v. Esparza, 540 U.S. 12, 124 S.Ct. 7, 11, 157 L.Ed.2d 263 (2003) (“A federal court may not overrule a state court for simply holding a view different from its own, when the precedent from [the Supreme] Court is, at best, ambiguous.”).
The dissent believes that jurors can generally impeach their verdict by testifying about any influence that had the “serious potential of swaying the jury towards a sentence of death,” (emphasis added), with the single exception that jurors cannot testify to their own physical or mental impairments because those influences only “impair [ ] the juror’s ... ability to function effectively.”17 According to at least a een-[365]*365tury of Supreme Court jurisprudence, the dissent has it backwards. As we have discussed, the “firmly established” general rule is that juror testimony may not be used to impeach a jury verdict. Tanner, 483 U.S. at 117, 107 S.Ct. 2739. The only exception to this rule is for external influence, as we have identified in Parker, Turner, and Remmer. But lest this exception be viewed as swallowing the rule, the Tanner Court reiterated that the general rule applies to situations that do not fit within the exception for external influence as identified by those cases. Tanner, 483 U.S. at 117, 107 S.Ct. 2739 (“In situations that did not fall into this exception for external influence, however, the Court adhered to the common-law rule against admitting juror testimony to impeach a verdict.”).
The dissent characterizes Tanner as only “coneern[ing] a phenomenon ... [of] influences that impair a juror’s mental or physical capacity.” Such is not the case. While Tanner is certainly focused on mental and physical impairment, its focus is narrowly circumscribed only because those were the facts presented to the Court. The legal rule of Tanner, however, is not so limited. By characterizing Tanner as related only to physical or mental impairments, the dissent conflates the rule with the rule’s application.
The facts of McDonald, 238 U.S. at 264, 35 S.Ct. 783, and Hyde v. United States, 225 U.S. 347, 32 S.Ct. 793, 56 L.Ed. 1114 (1912)—cases that Tanner cites approvingly as stating the general rule — illustrate this point. In McDonald, it was alleged that the jury neglected its duty to determine damages and instead used an improper quotient method, in which the damages were determined by adding each juror’s individual damage estimate and dividing by the total number of jurors. 238 U.S. at 265-66, 35 S.Ct. 783. Despite the obvious prejudice to the defendant, the Supreme Court did not allow the jury to impeach its own verdict. Id. at 269, 35 S.Ct. 783. In Hyde, the defendant alleged that the jury did not decide his guilt or innocence but instead had made a bargain among themselves to convict him in exchange for acquitting his fellow defendant. 225 U.S. at 347, 381-82, 32 S.Ct. 793. Even assuming the facts Hyde alleged were true, the Supreme Court agreed that there should be no inquiry into them because they involved “matters which essen^ tially inhere in the verdict itself and necessarily depend upon the testimony of the jurors, and can receive no corroboration.” 225 U.S. at 384, 32 S.Ct. 793. In these two cases, the jury’s actions were clearly improper; yet the Court did not allow- — ■ much less require — an inquiry into whether the defendant had been prejudiced. The dissent’s purported rule that an “external influence” is one that substantially sways the jurors against the defendant collapses in view of these cases: surely nothing can be more biased against a defendant than a jury in dereliction of its duty to decide his guilt or innocence.
Furthermore, not only does the dissent’s rule have no basis in Supreme Court precedent, it also ignores Tanner’s warning that the “integrity of jury proceedings” is jeopardized by inquiries “into the internal processes of the jury.” 483 U.S. at 120, 107 S.Ct. 2739. Under the dissent’s definition of “external influence,” the Sixth Amendment violation does not arise simply [366]*366by virtue of the Bible’s presence in the jury room alone; according to the dissent’s own formulation, the violation arises because the jury may have been swayed by “a divine command to condemn a defendant to death,”. On the dissent’s view, in other words, the problem must arise from the jurors’ hearing and obeying the divine commands. Following this logic, the dissent would allow Robinson a hearing even if the juror had merely recited from memory the “eye for an eye” passage during deliberations because this memorized recitation of divine commands “carries the serious potential of swaying the jury towards a sentence of death.”18 As discussed, however, such an inquiry is clearly prohibited. The fact that the bailiff provided the Bible to the juror does not alter our conclusion that it was not an external influence. Robinson does not allege that the bailiff instructed the jury to consult the Bible, or, for that matter, that he did anything other than simply provide the Bible upon the juror’s request. On these facts, the MAR court reasonably could have concluded that the bailiffs act of providing a Bible was nothing more than an innocuous intervention into the jury’s deliberations. Cf. Howard v. Moore, 131 F.3d 399, 422 (4th Cir.1997) (concluding that giving jurors scrap paper consisting of a prosecutor’s unused form letters thanking former jurors for their service was nothing more than an “innocuous intervention[ ]” (internal quotation marks omitted)). Indeed, it is reasonable to expect that a juror who wants something during deliberations — whether it is aspirin, a pen, or a Bible — will ask the bailiff to obtain it for him. The MAR court reasonably could have concluded that the bailiffs actions in fulfilling the juror’s request did not, without more, turn the Bible into an external influence.
Finally, in a statement that was obviously designed to excite the passions to a greater degree than the intellect, the dissent argues that our analysis “should be offensive to those who consider the Bible sacred” because we conclude “that a divine command to condemn a defendant to death carries less potential to influence a juror” than would a private communication, contact, or tampering. Surely the dissent, which does not cite a single sentence from our opinion in support of this outlandish claim, must recognize that our analysis is not based on a belief that the Bible has no ability to sway a juror, but on a belief that precisely because the Bible occupies a unique place in the moral lives of those who believe in it, its teachings cannot blithely be lumped together with a private communication, contact, or tampering with a juror without clear guidance from the Supreme Court. With all respect to our dissenting colleague, to argue that our analysis says anything more is simply misleading.
For the reasons discussed above, Robinson “has failed to show that the MAR court’s decision was ... an unreasonable application of [] clearly established Supreme Court precedent, because the decisions on which he relies ... are each distinguishable.” Conner v. Polk, 407 F.3d 198, 208 (4th Cir.2005). Therefore, Robinson is not entitled to habeas relief on his Sixth Amendment claim.
2.
Robinson asks us to remand for an evi-dentiary hearing on his Sixth Amendment [367]*367claim. The State argues that Robinson may not receive an evidentiary hearing because his MAR failed to comply with North Carolina’s procedural law. We review the district court’s denial óf an evi-dentiary hearing for abuse of discretion. See Walker v. True, 401 F.3d 574, 581 (4th Cir.2005).
A § 2254 petitioner may not receive an evidentiary hearing in the district court if he “ ‘failed to develop the factual basis of a claim in state court’ ” unless he shows the existence of several statutory factors not relevant here.19 See Fullwood v. Lee, 290 F.3d 663, 681 (4th Cir.2002) (quoting 28 U.S.C.A. § 2254(e)(2)). “A failure to develop the factual basis of a claim is not established unless there is a lack of diligence, or some greater fault attributable to the [petitioner] or the [petitioner’s] counsel.” (Michael) Williams v. Taylor, 529 U.S. 420, 432, 120 S.Ct. 1479, 146 L.Ed.2d 435 (2000). The State argues that North Carolina law requires that a MAR be accompanied by admissible evidence and that, by presenting only hearsay affidavits to the MAR court despite the fact he could have obtained affidavits directly from the jurors themselves, Robinson was not diligent in pursuing his Sixth Amendment claim in the MAR court.
We agree with the State that a petitioner who fails to comply with state law in seeking an evidentiary hearing can be held to lack diligence in pursuing his claim. Id. at 437, 120 S.Ct. 1479 (“Diligence will require in the usual case that the prisoner, at a minimum, seek an evidentiary hearing in state court in the manner prescribed by state law.”); see also Smith v. Bowersox, 311 F.3d 915, 921 (8th Cir.2002) (“[The petitioner’s] failure to comply with Missouri law reflects a lack of diligence.”). It is unclear, however, that Robinson failed to comply with state law by submitting hearsay affidavits in support of his MAR. To be sure, the law students’ affidavits are brimming with hearsay, and North Carolina law provides that they would be inadmissible at an evidentiary hearing in the MAR,court. State v. Adcock, 310 N.C. 1, 310 S.E.2d 587, 608 (1984). But whether inadmissible evidence can be used at an evidentiary hearing is a different question from whether inadmissible evidence can support a claim for entitlement to an evidentiary hearing. The State has not cited, and we have not found, a single North Carolina decision squarely holding that the MAR must be accompanied by - admissible evidence in order for the petitioner to demonstrate entitlement to an evidentiary hearing. Furthermore, the MAR court did not find that Robinson failed to comply with North Carolina law by failing to submit admissible evidence. Cf. Dowthitt v. Johnson, 230 F.3d 733, 758 (5th Cir.2000) (denying a federal evidentia-ry hearing to a petitioner because the state habeas court had concluded that the petitioner failed to properly develop the evi-dentiary basis of his claim). Because it is not clear that North Carolina rules require a MAR to be accompanied by admissible evidence and because the MAR court did not make such an evidentiary ruling, we cannot hold that Robinson’s failure to submit admissible evidence demonstrates a lack of diligence before the MAR court. Cf. Bacon, 225 F.3d at 477 (“[I]t is not our role ... to review the correctness of the [368]*368state MAR court’s application of its state-law procedural rules.... ”).
The fact that Robinson is not barred from receiving an evidentiary hearing in the district court, however, does not mean that he is automatically entitled to one. See Fullwood, 290 F.3d at 681. Instead, a district court may grant an evidentiary hearing in a § 2254 case only where the petitioner has “allege[d] additional facts that, if true, would entitle him to relief’ and has “establish[ed] one of the six factors set forth in Townsend v. Sain, 372 U.S. 293, 312, 83 S.Ct. 745, 9 L.Ed.2d 770 (1963).”20 Fullwood, 290 F.3d at 681 (internal quotation marks omitted). Robinson’s § 2254 petition, however, alleged the same facts that had been alleged before the MAR court. Because we conclude that thé MAR court did not unreasonably apply clearly established federal law to those facts, .Robinson has not alleged any “additional facts that, if true, would entitle him to relief,” and we therefore need not consider whether any of the Townsend factors have been met. Cardwell v. Greene, 152 F.3d 331, 338 (4th Cir.1998) (denying an evidentiary hearing where the petitioner “failed to forecast any evidence beyond that already contained in the record, or otherwise to explain how his claim would be advanced by an evidentiary hearing” (internal quotation marks omitted)), overruled on other grounds by Bell v. Jarvis, 236 F.3d 149 (4th Cir.2000); Bennett v. Angelone, 92 F.3d 1336, 1347 (4th Cir.1996) (holding, pre-AEDPA, that petitioner’s claim for an evidentiary hearing failed because he “add[ed] nothing ‘additional’ to the factual mix already before the district court”). The district court therefore did not abuse its discretion in denying Robinson an evidentiary hearing.
III.
Accordingly, we affirm the district court’s decision denying Robinson’s § 2254 petition and denying him an evidentiary hearing.
AFFIRMED