A Well-used Door Needs No Oil On Its Hinges. A Swift-flowing Steam Does No Grow Stagnant.

HomeFortune CookiesMiscellaneous Collections

A well-used door needs no oil on its hinges.
A swift-flowing steam does no grow stagnant.
Neither sound nor thoughts can travel through a vacuum.
Software rots if not used.

These are great mysteries.
-- Geoffrey James, "The Tao of Programming"

Related: