That series of inventions by which man from age to age has remade his environment is a different kind of evolution -- not biological, but cultural evolution . . . "The Ascent of Man.

It is important that students bring a certain ragamuffin, barefoot irreverence to their studies; they are not here to worship what is known, but to question it.

No science is immune to the infection of politics and the corruption of power.

Ask an impertinent question and you are on the way to the pertinent answer.

Man is unique not because he does science, and his is unique not because he does art, but because science and art equally are expressions of his marvelous plasticity of mind.

Knowledge is an unending adventure at the edge of uncertainty.

The hand is the cutting edge of the mind.

We have to understand that the world can only be grasped by action, not by contemplation. The hand is more important than the eye ... The hand is the cutting edge of the mind.

Man masters nature not by force, but by understanding

Dissent is the mark of freedom.

One aim of physical sciences had been to give an exact picture the material world. One achievement of physics in the twentieth century has been to prove that that aim is unattainable.

If a fourteen year-old can deliver your message, it's not because he's gifted. It's because intellectually, you're a child.

I've loved many women...I'm not going to lie to you, but it never works...vanity always gets in the way.

I was blessed with a birth and a death, and I guess I just want some say in between.

It is to be regretted that the rich and powerful too often bend the acts of government to their own selfish purposes.

I didn't start out to chart the skies; it's just no one had done it before.

A person of knowledge and power never goes out looking for battles. All their battles are within.

I have lived too long in foreign parts

I don't think I'm unbeatable, nobody is

A democrat must be utterly selfless. He must think and dream not in terms of self or of party, but only of democracy.

Now no way can I stray; Save back to England, all the world's my way.