One original thought is worth the sum total of human knowledge, because it advances the sum total of human knowledge by that one original thought.

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.

My favorite procrastination is to make the choice to have valuable times with human beings that I care about instead of holing myself up alone to get my work done.

One must never forbid oneself anything. One must also be able to go back, one must always be able to change.

Freedom is the most contagious virus known to man.

I care about what I look like on the red carpet.

You can overcome wrong technology. Your people have the initiative, they see the problem, no big deal ... you can't overcome bad culture. You've gotta change whoever is in charge.

Avowed work, even when uncongenial, is far less trying to patience than feigned pleasure.

And now, I am dying beyond my means. (Said while sipping champagne on his deathbed.)

The discovery of the unconscious is a great spiritual undertaking.

On Halloween, the parents sent their kids out looking like me.

A play should give you something to think about. When I see a play and understand it the first time, then I know it can't be much good.