The main thing needed to make men happy is intelligence.

Hitler is an outcome of Rousseau.

Law in origin was merely a codification of the power of dominant groups, and did not aim at anything that to a modern man would appear to be justice

One is always a little afraid of love, but above all, one is afraid of pain or causing pain.

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 essence of the liberal outlook lies not in what opinions are held, but in how they are held; instead of being held dogmatically, they are held tentatively, and with a consciousness that new evidence may at any moment lead to their abandonment.

The wise man will be as happy as circumstances permit, and if he finds the contemplation of the universe painful beyond a point, he will contemplate something else instead.