It permits the law to move with the times, as aptly illustrated by Cardozo’s comparison of the automobile wheels to those of the stagecoach. It is the counter-agent of attempts to embalm legal precepts. It permits the elasticity necessary in order to hearken to the adage: “The law must be stable, but it must not stand still.”

Ruggero J. Aldisert, Agatha D. Aldisert, Logic for Lawyers- A Guide …, loc. 613