The deepest and rarest kind of courage has nothing to do with feats or obstacles in the outside world; and, indeed, has nothing to do with the outside world - it is the courage to be who you are.

Why are we willing to accept a new mathematical formula we don't understand as the product of a brilliant mind, while rejecting a new art form we don't understand as the product of a deranged mind?

We evaluate others with a Godlike justice, but we want them to evaluate us with a Godlike compassion.

We can often endure an extra pound of pain far more easily than we can suffer the withdrawal of an ounce of accustomed pleasure.

Good teaching must be slow enough so that it is not confusing, and fast enough so that it is not boring.

The main discomfort in being a middle-of-the-roader is that you get sideswiped by partisans going in both directions.

Nobody can misunderstand a child as much as his own parents.