Article VI, § 10

Supreme court justices and district court judges shall be citizens of the United States and residents of this state, shall be learned in the law, and shall possess any additional qualifications prescribed by law. Judges of other courts shall be selected for such terms and shall have such qualifications as may be prescribed by law. No justice of the supreme court or judge of the district court of this state shall engage in the practice of law, or hold any public office, elective or appointive, not judicial in nature. No duties shall be imposed by law upon the supreme court or any of the justices thereof, except such as are judicial, nor shall any of the justices exercise any power of appointment except as herein provided. No judge of any court of this state shall be paid from the fees of his office, nor shall the amount of his compensation be measured by fees, other moneys received, or the amount of judicial activity of his office.