Own only what you can carry with you; know language, know countries, know people. Let your memory be your travel bag.

Our envy of others devours us most of all.

When men exercise their reason coolly and freely on a variety of distinct questions, they inevitably fall into different opinions on some of them. When they are governed by a common passion, their opinions, if they are to be called, will be the same.

[Memory is] a man's real possession...In nothing else is he rich, in nothing else is he poor.

Men should be like Kleenex, soft, strong and disposable.

Fight for your opinions, but do not believe that they contain the whole truth, or the only truth.