The best men of the best epochs are simply those who make the fewest blunders and commit the fewest sins.

Science is simply common sense at its best, that is, rigidly accurate in observation, and merciless to fallacy in logic.

Those who can make you believe absurdities can make you commit atrocities.

What sorts of sin?"

Any sort. When other people commit them, you are startled, but when you commit them yourself, they seem absolutely natural.

Logical consequences are the scarecrows of fools and the beacons of wise men.

It was one of those evenings when men feel that truth, goodness and beauty are one. In the morning, when they commit their discovery to paper, when others read it written there, it looks wholly ridiculous.