Either man will abolish war, or war will abolish man.

An individual human existence should be like a river

It's not what you have lost, but what you have left that counts.

Zeno was concerned with three problems... These are the problem of the infinitesimal, the infinite, and continuity.

There can't be a practical reason for believing something that is not true.

The really useful education is that which follows the direction of the child's own instinctive interests, supplying knowledge for which it is seeking, not dry, detailed information wholly out of relation to its spontaneous desires.

Self-respect will keep a man from being abject when he is in the power of enemies, and will enable him to feel that he may be in the right when the world is against him.