Never underestimate the power of collaboration—great things are rarely achieved alone.

Positive psychology is as concerned with strength as with weakness, as interested in building the best things in life as in repairing the worst.

The writer’s joy is the thought that can become emotion, and the emotion that can wholly become a thought.

Children have real understanding only of that which they invent themselves, and each time that we try to teach them something too quickly, we keep them from reinventing it themselves.