The preoccupation with the choice of a mate both by male and female I regard as a continuing echo of the major selective force by which we have evolved.

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.

Heavenly onwards!

Most man can think no better than a child! This fact perfectly explains why there are so many funny beliefs!

Nihilism, there's really nothing to it.

I'm feeling generous today. You get to live.

Folks as have no mind to be o' use have allays the luck to be out o' the road when there's anything to be done.

The only time I ever went hunting I remembered it as a grisly experience.

One cannot be prepared for something while secretly believing it will not happen.

He’s like the Rasputin of reapers.

There's guilt about our treatment of native peoples in modern intellectual life, and an unwillingness to acknowledge there could be anything good about Western culture.

Take away the miseries and you take away some folks' reason for living.