To the young I should offer two maxims: Don't accept superficial solutions of difficult problems. It is better to do a little good than much harm. I should not offer anything more specific; every young person should decide on his or her own credo.

When one admits that nothing is certain one must, I think, also admit that some things are much more nearly certain than others.

In spreading his ideas, Plato was willing to employ emotional appeals, state propaganda, and the use of force.

The skill of the politician consists in guessing what people can be brought to think advantageous to themselves; the skill of the expert consists in calculating what really is advantageous, provided people can be brought to think so.

Hitler is an outcome of Rousseau.

When two great powers disagree about anything - it doesn't matter what - they must find a way to settle it somehow by arbitration or by negotiation, not by war or threat of war.

The power of thought, the vast regions it can master.