A mind that is stretched by a new experience can never go back to its old dimensions.

To rest upon a formula is a slumber that, prolonged, means death.

A word is not a crystal, transparent and unchanged; it is the skin of a living thought and may vary greatly in color and content according to the circumstances and time in which it is used.

It is perfectly easy to be original by violating the laws of decency and the canons of good taste.

But the moment you turn a corner you see another straight stretch ahead and there comes some further challenge to your ambition.

The most stringent protection of free speech would not protect a man in falsely shouting fire in a theater and causing a panic.

Fame usually comes to those who are thinking about something else.