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

A thought is an idea in transit.

If I could explain it to the average person, I wouldn't have been worth the Nobel Prize.

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

I like poems you can tack all over with a hammer and there are no hollow places.

Those who fail to learn the lessons of history are doomed to repeat them.

The progressive development of man is vitally dependent on invention.

The reading of all good books is like conversation with the finest men of past centuries.

Don't learn to do, but learn in doing.

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.

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

If you're teaching today what you were teaching five years ago, either the field is dead or you are.

You can never be overdressed or overeducated.

Education is an ornament for the prosperous, a refuge for the unfortunate.

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

Men are born ignorant, not stupid. They are made stupid by education.

Words can be like X-rays if you use them properly - they'll go through anything. You read and you?re pierced.

Just because I don't care doesn't mean I don't understand.

The deepest sin against the human mind is to believe things without evidence.

In mathematics you don't understand things. You just get used to them.

A little knowledge is a dangerous thing. So is a lot.