THE CONSTITUTION

Article III

Section 1. The judicial Power of the United States, shall be vested in one supreme Court, and in such inferior Courts as the Congress may from time to time ordain and establish. The Judges, both of the supreme and inferior Courts, shall hold their Offices during good Behaviour, and shall, at stated Times, receive for their Services, a Compensation, which shall not be diminished during their Continuance in Office.

Now we come to the third part of our three part government, the Judicial Branch. This is were we get lifetime appointments to the bench and allow them to get paid for their time. Notice that you could not lower their salary if you didn't like their decisions.
:)