True knowledge exists in knowing that you know nothing. And in knowing that you know nothing, that makes you the smartest of all.

I believe that we cannot live better than in seeking to become better, nor more agreeably than having a clear conscience.

When you want success as badly as you want the air, then you will get it. There is no other secret of success.

One thing I know, that I know nothing. This is the source of my wisdom.

When our feet hurt, we hurt all over.

It is possible that a man could live twice as long if he didn't spend the first half of his life acquiring habits that shortens the other half

Nothing is so well learned as that which is discovered.