He who laughs at everything is as big a fool as he who weeps at everything.

The wise man does at once what the fool does finally.

Dreams will get you nowhere, a good kick in the pants will take you a long way.

He that can live alone resembles the brute beast in nothing, the sage in much, and God in everything.

It is better to sleep on things beforehand than lie awake about them afterwards.

Self-reflection is the school of wisdom.

The wise have a solid sense of silence and the ability to keep a storehouse of secrets. Their capacity and character are respected.

Know or listen to those who know.

To find one real friend in a lifetime is good fortune; to keep him is a blessing.

There are friendships merely for pleasure, some for the exchange of ideas. Rarest are those friends of one's inmost self.

A single lie destroys a whole reputation for integrity.

Stand up for what is right even if you stand alone.

If I hadn't been inside of Biosphere 2 and really lived a biological life-support system, I definitely would not be involved in life-support systems for space.

Where is all the knowledge we lost with information?

Logic never attracts men to the point of carrying them away.

Liars when they speak the truth are not believed.

No old Men (excepting Dr. Wallis) love Mathematicks.

And God stepped out on space, and He looked around and said: I'm lonely - I'll make me a world.

Our greatest indulgence towards a man springs from our despair of him.

All couples must bear the strain of getting acquainted, having been, up to then, merely intimate.

Wouldn't you like to weigh what it says on your driver's license?