You need not wonder whether you should have an unreliable person as a friend. An unreliable person is nobody's friend.

Sometimes a pessimist is only an optimist with extra information.

MAN: Kick him-he'll forgive you. Flatter him-he may or may not see through you. But ignore him and he'll hate you

Enemies are often former or potential friends who have been denied - or think that they have been denied - something.

Learn to be as analytical about things of which you are credulous as you are of those which you criticise.

A motto of the human race: Let me do what I like, and give me approval as well.

A man who believes the word of a donkey in preference to my word does not deserve to be lent anything.