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

Formula to live your dream: 1. Be bold. 2. Begin now, 3. No exceptions.

Regarding mutual tolerance: It is negative in one sense, but positive in another. It absolutely forbids us to be forward in pronouncing on the meaninglessness of forms of existence other than our own; and it commands us to tolerate, respect, and indulge those whom we see harmlessly interested and happy in their own ways, however unintelligible these may be to us. Hands off.

Great emergencies and crises show us how much greater our vital resources are than we had supposed.

A little cooling down of animal excitability and instinct, a little loss of animal toughness, a little irritable weakness and descent of the pain-threshold, will bring the worm at the core of all our usual springs of delight into full view, and turn us into melancholy metaphysicians.

Objective evidence and certitude are doubtless very fine ideals to play with, but where on this moonlit and dream-visited planet are they found?

We are spinning our own fates, good or evil, and never to be undone. Every smallest stroke of virtue or of vice leaves its never so little scar. ...Nothing we ever do is, in strict scientific literalness, wiped out.