Medicine is my lawful wife and literature my mistress; when I get tired of one, I spend the night with the other.

Industrialize or perish.

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

To every action there is always an equal and opposite or contrary, reaction

If you want the present to be different from the past, study the past.

The progressive development of man is vitally dependent on invention.

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

The great difficulty in education is to get experience out of ideas.

The direction in which education starts a man will determine his future in life

All stable processes we shall predict. All unstable processes we shall control.

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.

Any knowledge that doesn't lead to new questions quickly dies out: it fails to maintain the temperature required for sustaining life.

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

I cannot live without books.

Education is an admirable thing, but it is well to remember from time to time that nothing that is worth knowing can be taught.

Science is a rising force, It is creating a new world about us. It needs to be watched and pressed into service, and in any case, it would be courting disaster to ignore it.

It is better to know how to learn than to know.

Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.

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

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

What is now proved was once only imagined.