Virtue is insufficient temptation.

Few people think more than two or three times a year; I have made an international reputation for myself by thinking once or twice a week.

A life spent making mistakes is not only more honorable, but more useful than a life spent doing nothing.

Imagination is the beginning of creation. You imagine what you desire, you will what you imagine and at last you create what you will.

You see things, and you say “Why?” But I dream things that never were, and say “Why not?

Common sense is instinct. Enough of it is genius.

Do you know what a pessimist is? A person who thinks everybody is as nasty as himself and hates them for it.

Except during the nine months before he draws his first breath, no man manages his affairs as well as a tree does.