To do a job effectively, one must set priorities. Too many people let their “in” basket set the priorities. On any given day, unimportant but interesting trivia pass through an office; one must not permit these to monopolize his time. The human tendency is to while away time with unimportant matters that do not require mental effort or energy. Since they can be easily resolved, they give a false sense of accomplishment. The manager must exert self-discipline to ensure that his energy is focused where it is truly needed.

Hyman Rickover (1900-1986) US Navy Admiral
(Attributed)

Quoted in T. Rockwell, The Rickover Effect (1992)