What is morality in any given time or place? It is what the majority then and there happen to like and immorality is what they dislike.

In a sense, knowledge shrinks as wisdom grows: for details are swallowed up in principles.

On the ostensible exactitude of certain branches of human knowledge, including mathematics. The exactness is a fake.

Error is the price we pay for progress.

What the learned world tends to offer is one second-hand scrap of information illustrating ideas derived from another second-hand scrap of information. The second-handedness of the learned world is the secret of its mediocrity.

The worst that happened to men of science was that Galileo suffered an honorable detention and a mild reproof, before dying peacefully in his bed.

Algebra is the intellectual instrument which has been created for rendering clear the quantitative aspects of the world.