What does a life term for Supreme Court justices depend on?

A life term for Supreme Court justices is indeed contingent upon good behavior, as established under Article III of the U.S. Constitution. This provision allows justices to serve for life unless they resign, retire, or are removed from their position through impeachment. The phrase "good behavior" implies that justices are expected to maintain an ethical standard and uphold the integrity of the judiciary.

The intent behind this lifetime appointment is to ensure judicial independence, allowing justices to make decisions based on the law and Constitution, free from political pressure or the fear of losing their position due to unpopular rulings. This lifetime tenure is designed to promote stability and continuity in the interpretation of the law, which is critical for the functioning of a fair and impartial legal system. Thus, justices can only be removed from office if they commit serious misconduct, which is the essence of serving "during good behavior."