The key to happiness is accepting one unpleasant reality every day.

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

You must believe that you can help bring about a better world.

Man needs, for his happiness, not only the enjoyment of this or that, but hope and enterprise and change.

It is only through imagination that men become aware of what the world might be; without it, ‘progress’ would become mechanical and trivial.

Aristotle, in spite of his reputation, is full of absurdities. He says that children should be conceived in the Winter, when the wind is in the North, and that if people marry too young the children will be female. He tells us that the blood of females is blacker than that of males; that the pig is the only animal liable to measles; that an elephant suffering from insomnia should have its shoulders rubbed with salt, olive-oil, and warm water; that women have fewer teeth than men, and so on. Nevertheless, he is considered by the great majority of philosophers a paragon of wisdom.

An individual human existence should be like a river