See Full Constitution
Part First
Article 35. The Judiciary; Tenure of Office, etc.
It is essential to the preservation of the rights of every individual, his life, liberty, property, and character, that there be an impartial interpretation of the laws, and administration of justice. It is the right of every citizen to be tried by judges as impartial as the lot of humanity will admit. It is therefore not only the best policy, but for the security of the rights of the people, that the Judges of the Supreme Judicial Court should hold their offices so long as they behave well; subject, however, to such limitations, on account of age, as may be provided by the Constitution of the State; and that they should have honorable salaries, ascertained and established by standing laws.