Most of us lead busy, but undisciplined lives. We have ever expanding “to do” lists, trying to build momentum by doing, doing, and doing more. And it rarely works. Those who build the good-to-great companies, however, made as much use of “stop doing” lists as the “to do” lists. They displayed a remarkable amount of discipline to unplug all sorts of extraneous junk… they displayed remarkable courage to channel their resources into only one or a few arenas.
— Jim Collins