You can say the opposite of something you've said but you can't do the opposite of something you've done.

To be young is to live in the hope of escaping youth; to be old, in the despair of having succeeded.

The quality of a man's mind can generally be judged by the size of his wastepaper basket.

You need to have a God, a lover, and an enemy, says the poet. Exactly: you need to have three enemies.

When there is nothing to fear is the time to begin fearing everything.

The thirst for adventure is the vent which Destiny offers; a war, a crusade, a gold mine, a new country, speak to the imagination and offer.

A rocket is a reed that thinks brilliantly.