It is not pleasure that makes life worth living. It is life that makes pleasure worth having.

I assume that to prevent illness in later life, you should never have been born at all.

If a group of beings from another planet were to land on Earth - beings who considered themselves as superior to you as you feel yourself to be to other animals - would you concede them the rights over you that you assume over other animals?

A man is like a phonograph with half-a-dozen records. You soon get tired of them all; and yet you have to sit at table whilst he reels them off to every new visitor.

The devil can quote Shakespeare for his own purpose.

Though I can make my extravaganzas appear credible, I cannot make the truth appear so.

It is not the number of years we have behind us, but the number we have before us, that makes us careful and responsible and determined to find out the truth about everything.