" Presidents may run for office on ideological platforms and promised policies, but their presidency is actually defined by the encounter between fortune and virtue, between the improbable and the unexpected—the thing that neither their ideology nor their proposals prepared them for—and their response. The president’s job is to anticipate what will happen, minimize the unpredictability, then respond to the unexpected with cunning and power. "

― George Friedman , The Next Decade: What the World Will Look Like