Willpower: Rediscovering Our Greatest Strength

by Roy F. Baumeister

Sociologists identified a new generation of “other-directed” people who were guided by their neighbors’ opinions rather than by strong inner moral convictions.

self-control turned out to be the only trait that predicted a college student’s grade-point average better than chance. Self-control also proved to be a better predictor of college grades than the student’s IQ or SAT score.