In the company of friends, writers can discuss their books, economists the state of the economy, lawyers their latest cases, and businessmen their latest acquisitions, but mathematicians cannot discuss their mathematics at all. And the more profound their work, the less understandable it is.

It is always easier to fight for one's principles than to live up to them.

Every pampered child becomes a hated child.... There is no greater evil than the pampering of children.

There is a courage of happiness as well as a courage of sorrow.

Trust only movement. Life happens at the level of events, not of words. Trust movement.

The goal of the human soul is conquest, perfection, security, superiority.

Follow your heart always, and remember to take your head along with you.