In Federalist No. 78, Alexander Hamilton wrote:

. . .liberty can have nothing to fear from the judiciary alone, but would have every thing to fear from its union with either of the other departments; . . . that as nothing can contribute so much to its firmness and independence as permanency in office, this quality may therefore be justly regarded as an indispensable ingredient in its constitution, and, in a great measure, as the citadel of the public justice and the public security.