I became insane, with long intervals of horrible sanity.

Curiosity is the driving force behind all great mathematical discoveries.

The returns to education are higher than most people realize.

The fact remains that getting people right is not what living is all about anyway. It's getting them wrong that is living, getting them wrong and wrong and wrong and then, on careful reconsideration, getting them wrong again.

A law of nature， lex naturalis， is a precept or general rule found out by reason， by which a man is forbidden to do that which is destructive of his life or takes away the means of preserving the same.

快乐的人，只有快乐的人，是能把今天称为自己所有的那个人。