The man who writes about himself and his own time is the only man who writes about all people and about all time.
Science never solves a problem without creating ten more.
The power of accurate observation is commonly called cynicism by those who have not got it.
The minority is sometimes right; the majority always wrong.
The single biggest problem in communication is the illusion that it has taken place.
The man with a toothache thinks everyone happy whose teeth are sound. The poverty-stricken man makes the same mistake about the rich man.
The possibilities are numerous once we decide to act and not react.
The moment we want to believe something, we suddenly see all the arguments for it, and become blind to the arguments against it.
The natural term of the affection of the human animal for its offspring is six years.
The only secrets are the secrets that keep themselves.
The only service a friend can really render is to keep up your courage by holding up to you a mirror in which you can see a noble image of yourself.
The only way to avoid being miserable is not to have enough leisure to wonder whether you are happy or not.
The people who get on in this world are the people who get up and look for the circumstances they want and if they can't find them, make them.
The perfect love affair is one which is conducted entirely by post.