Physics is like sex: sure, it may give some practical results, but that's not why we do it.

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

The most important part of teaching is to teach what it is to know.

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

A little knowledge that acts is worth infinitely more than much knowledge that is idle.

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

Education is the most powerful weapon which you can use to change the world.

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

Real learning comes about when the competitive spirit has ceased.

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

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

Opinion is the medium between knowledge and ignorance.

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

All sciences are vain and full of errors that are not born of Experience, the mother of all Knowledge.

There is one quality which one must possess to win, and that is definiteness of purpose, the knowledge of what one wants, and a burning desire to possess it.

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

Reading is to the mind what exercise is to the body.

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

When I am attacked by gloomy thoughts, nothing helps me so much as running to my books. They quickly absorb me and banish the clouds from my mind.

Know what you are talking about.

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.