Seek simplicity, and distrust it.

The aims of scientific thought are to see the general in the particular and the eternal in the transitory.

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.

Everyone is a philosopher. Not everyone is good at it.

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

Imagination is not to be divorced from the facts. It is a way of illuminating the facts.

One main factor in the upward trend of animal life has been the power of wandering.