Be less curious about people and more curious about ideas.

It seldom happens that any felicity comes so pure as not to be tempered and allayed by some mixture of sorrow.

All is disgust when a man leaves his own nature and does what is unfit.

I don't try to imagine a personal god; it suffices to stand in awe at the structure of the world, insofar as it allows our inadequate senses to appreciate it.

Freedom lies in being bold.

Never lend your car to someone you've given birth to.

It is a process of diverting one's scattered forces into one powerful channel.

If the world was perfect, it wouldn't be.

Liberty, according to my metaphysics is a self-determining power in an intellectual agent. It implies thought and choice and power.

You're only given a little spark of madness. You mustn't lose it.

I can bear any pain as long as it has meaning.

Charity ... is the opium of the privileged.

An intellectual is a man who doesn't know how to park a bike.

We can't become what we need to be by remaining what we are.

A scientific man ought to have no wishes, no affections, - a mere heart of stone.

Genius is sorrow's child.

It is a good rule in life never to apologize. The right sort of people do not want apologies, and the wrong sort take a mean advantage of them.

Don't take the wrong side of an argument just because your opponent has taken the right side.

I want to put a ding in the universe.

Every man is guilty of all the good he did not do.

Character is like a tree and reputation like a shadow. The shadow is what we think of it; the tree is the real thing.