If you can't say something good about someone, sit right here by me.

There are four million different kinds of animals and plants in the world. That’s four million solutions to the problem of staying alive.

Outstanding people have one thing in common: an absolute sense of mission

I like university professors, but you know, we shouldn't hold them up as the high-water mark of all human achievement. They're just a form of life, another form of life.

A human being is a deciding being.

All is in the hands of man. Therefore wash them often.

The highest forms of understanding we can achieve are laughter and human compassion.

A wise man can play the part of a clown, but a clown can't play the part of a wise man.

Take away paradox from the thinker and you have a professor.

One of the greatest diseases is to be nobody to anybody.

I just invent, then wait until man comes around to needing what I've invented.

Human history is in essence a history of ideas.

We are just an advanced breed of monkeys on a minor planet of a very average star. But we can understand the Universe. That makes us something very special.

It's funny how humans can wrap their mind around things and fit them into their version of reality.

Great men are like eagles, and build their nest on some lofty solitude.

That man is the noblest creature may also be inferred from the fact that no other creature has yet contested this claim.

All sins are attempts to fill voids.

Stupid men are often capable of things the clever would not dare to contemplate...

Are we happy that our grandchildren may never seen an elephant except in a picture book?

A musician must make music, an artist must paint, a poet must write, if he is to be ultimately at peace with himself. What a man can be, he must be

Man has the power to act as his own destroyer - and that is the way he has acted through most of his history.