The good-enough leader operates within the givens of a system to benefit a single group, executing a mission as directed, taking on the problems of the day. In contrast, a great leader defines a mission, acts on many levels, and tackles the biggest problems. Great leaders do not settle for systems as they are, but see what they could become, and so work to transform them for the better, to benefit the widest circle.
— Focus: The Hidden Driver of Excellence (Daniel Goleman), Loc. 3386–9