Liberty is the right to do what I like; licence, the right to do what you like.

In all the creative work that I have done, what has come first is a problem, a puzzle involving discomfort.

Neither acquiescence in skepticism nor acquiescence in dogma is what education should produce.

Christ . . . said that a man who had looked after a woman lustfully had sinned as much as the man who had seduced her. How absurd!

How much longer is the world willing to endure this spectacle of wanton cruelty?

The pure mathematician, like the musician, is a free creator of his world of ordered beauty.

Right discipline consists, not in external compulsion, but in the habits of mind which lead spontaneously to desirable rather than undesirable activities.