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

With educated people, I suppose, punctuation is a matter of rule; with me it is a matter of feeling. But I must say I have great respect for the semi-colon; it's a useful little chap.

God created man in His own image, says the Bible; philosophers reverse the process: they create God in theirs.

I cannot live without books.

A thought is an idea in transit.

If you can't explain it simply, you don't understand it well enough.

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.

Just when I thought there wasn't room enough for another thought in my head, I had this great idea.

Most people have never learned that one of the main aims in life is to enjoy it.

The man who does not read good books has no advantage over the man who can't read them.

The fullness of knowledge only comes through the awareness of ignorance.

Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it.

If I have seen further it is by standing on the shoulders of Giants.

Reading furnishes the mind only with materials of knowledge; it is thinking that makes what we read ours.

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

Industrialize or perish.

The first idea the child must acquire is that of the difference between good and evil.

Science is a way of thinking much more than it is a body of knowledge.

Science is not only a disciple of reason but, also, one of romance and passion.

For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.