What work I have done I have done because it has been play. If it had been work I shouldn't have done it.

When your friends begin to flatter you on how young you look, it's a sure sign you're getting old.

It isn't safe to sit in judgment upon another person's illusion when you are not on the inside. While you are thinking it is a dream, he may be knowing it is a planet.

The easy confidence with which I know another man's religion is folly teaches me to suspect that my own is also. I would not interfere with any one's religion, either to strengthen it or to weaken it. I am not able to believe one's religion can affect his hereafter one way or the other, no matter what that religion may be. But it may easily be a great comfort to him in this life-hence it is a valuable possession to him.

Pessimism is only the name that men of weak nerve give to wisdom.

A half-educated physician is not valuable. He thinks he can cure everything.

When the human race has once acquired a superstition, nothing short of death is ever likely to remove it.