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

There is no authority who decides what is a good idea.

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

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

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

Real learning comes about when the competitive spirit has ceased.

Human behavior flows from three main sources: desire, emotion, and knowledge

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

What is freedom of expression? Without the freedom to offend, it ceases to exist.

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

The highest result of education is tolerance.

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

Show me a family of readers, and I will show you the people who move the world.

Liberty without Learning is always in peril and Learning without Liberty is always in vain.

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.

I cannot live without books.

Dare to think for yourself.

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

All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.

Any sufficiently advanced technology is indistinguishable from magic.

Knowledge is power. Information is liberating. Education is the premise of progress, in every society, in every family.