Philosophy is the product of wonder.

Religion will not regain its old power until it can face change in the same spirit as does science.

War can protect; it cannot create.

It is a safe rule to apply that, when a mathematical or philosophical author writes with a misty profundity, he is talking nonsense.

There is a technique, a knack, for thinking, just as there is for doing other things. You are not wholly at the mercy of your thoughts, any more than they are you. They are a machine you can learn to operate.

Aristotle discovered all the half-truths which were necessary to the creation of science.

That knowledge which adds greatness to character is knowledge so handled as to transform every phase of immediate experience.