“Every revolutionary idea seems to evoke three stages of reaction. They may be summed up by the phrases: (1) It's completely impossible. (2) It's possible, but it's not worth doing. (3) I said it was a good idea all along.”

“All the interests of my reason, speculative as well as practical, combine in the three following questions: 1. What can I know? 2. What ought I to do? 3. What may I hope?”

“Good values are 1) reality-based, 2) socially constructive, and 3) immediate and controllable.
Bad values are 1) superstitious, 2) socially destructive, and 3) not immediate and controllable.”

“The stages of human development are to strive for:
(1) Besitz [Possession]
(2) Wissen [Knowledge]
(3) Können [Ability]
(4) Sein”

“Zee said, grumpily, “Liebling, this is not a good idea.”
“Zee,” I told him, “I am completely out of good ideas and am doing my best with the bad ones I have left.”

“The Three Kinds of Pride are: (1) thinking I am better than the other(s); (2) thinking I am worse than the other(s); and (3) thinking I am just as good as the other(s).”

“The three rules of the Librarians of Time and Space are: 1) Silence; 2) Books must be returned no later than the last date shown; and 3) Do not interfere with the nature of causality.”

“To change one’s life:
1. Start immediately.
2. Do it flamboyantly.
3. No exceptions.”

“Impossibility is only a sum of greater unrealised possibles. It veils an advanced stage and a yet unaccomplished journey.”

“To sum up: 1. The cosmos is a gigantic fly-wheel making 10,000 revolutions a minute. 2. Man is a sick fly taking a dizzy ride on it. 3. Religion is the theory that the wheel was designed and set spinning to give him the ride.”