“Leadership is most essential during periods of transition, when values and institutions are losing their relevance, and the outlines of a worthy future are in controversy. In such times, leaders are called upon to think creatively and diagnostically: what are the sources of the society’s well-being? Of its decay? Which inheritances from the past should be preserved, and which adapted or discarded? Which objectives deserve commitment, and which prospects must be rejected no matter how tempting? And, at the extreme, is one’s society sufficiently vital and confident to tolerate sacrifice as a waystation to a more fulfilling future?”