Knowledge is an unending adventure at the edge of uncertainty.

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.

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.

A genius is a man who has two great ideas.

...but I am only one, and if I can make a difference, so can you...

A man's admiration of absolute government is proportionate to the contempt he feels for those around him.

I think that if my kids are completely convinced of God's unfailing love for them, whether they fail or not, they'll have confidence to persevere in life

No person ever died by drowning in their own sweat.

Whether you want to call it God or the mystery of the cosmos doesn't matter to me.

It is dressed into speeches about patriotism, love of country...but the profits...skyrocket.

Political rhetoric leads only to confusion.

I think sometimes you have to see a physical manifestation of your dream. Otherwise you have to hope, pray and try to conjure something in your mind to feel like it's possible.

Defer no time, delays have dangerous ends.