The first lecture in psychology that I ever heard was the first I ever gave.

Why may we not be in the universe, as our dogs and cats are in our drawingrooms and libraries?

Choose a self and stand by it.

I believe there is no source of deception in the investigation of nature which can compare with a fixed belief that certain kinds of phenomena are IMPOSSIBLE.

Asceticism may be a mere expression of organic hardihood, disgusted with too much ease.

To know psychology, therefore, is absolutely no guarantee that we shall be good teacher.

If this life is not a real fight, in which something is eternally gained for the universe by success, it is no better than a game of private theatricals from which one may withdraw at will. But it feels like a real fight.