The main thing needed to make men happy is intelligence.

Envy is the basis of democracy.

Religion is based, I think, primarily and mainly upon fear.

For a good notation has a subtlety and suggestiveness which at times make it seem almost like a live teacher.

Sir Arthur Eddington deduces religion from the fact that atoms do not obey the laws of mathematics. Sir James Jeans deduces it from the fact that they do.

So long as there is death there will be sorrow, and so long as there is sorrow it can be no part of the duty of human beings to increase its amount, in spite of the fact that a few rare spirits know how to transmute it.

The more things a man is interested in, the more opportunities of happiness he has and the less he is at the mercy of fate, since if he loses one thing he can fall back upon another.