Mathematical proofs, like diamonds, are hard as well as clear.

The ideas of economists and political philosophers, both when they are right and when they are wrong, are more powerful than is commonly understood. Indeed, the world is ruled by little else. Practical men, who believe themselves to be quite exempt from intellectual influences, are usually the slaves of some defunct economist. Madmen in authority, who hear voices in the air, are distilling their frenzy from some academic scribbler of a few years back.

What if this world was free, would there be world peace?

History does not repeat itself, but it does rhyme.

You’re just like an angel: your skin makes me cry.