The highest activity a human being can attain is learning for understanding, because to understand is to be free.

Language is courage: the ability to conceive a thought, to speak it, and by doing so to make it true.

Evil being the root of mystery, pain is the root of knowledge.

It took us three years to build the NeXT computer. If we'd given customers what they said they wanted, we'd have built a computer they'd have been happy with a year after we spoke to them - not something they'd want now.

I cannot live without books.

If there were no bad people, there would be no good lawyers.

The books that the world calls immoral are books that show the world its own shame.

We could never learn to be brave and patient, if there were only joy in the world

An investment in knowledge pays the best interest.

Books are as useful to a stupid person as a mirror is useful to a blind person.

A cynic is a man who knows the price of everything, and the value of nothing.

The progressive development of man is vitally dependent on invention.

As we acquire more knowledge, things do not become more comprehensible but more mysterious.

The white man is very clever. He came quietly and peaceably with his religion. We were amused at his foolishness and allowed him to stay. Now he has won our brothers, and our clan can no longer act like one. He has put a knife on the things that held us together and we have fallen apart.

I learned very early the difference between knowing the name of something and knowing something.

What sculpture is to a block of marble, education is to a human soul.

The real solution lies in a world in which charity will have become unnecessary.

It is what you read when you don't have to that determines what you will be when you can't help it.

One test of the correctness of educational procedure is the happiness of the child.

Education is the ability to listen to almost anything without losing your temper or your self-confidence.

A thought is an idea in transit.