Know what you are talking about.

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

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

He who would learn to fly one day must first learn to stand and walk and run and climb and dance; one cannot fly into flying.

The schools ain't what they used to be and never was.

The white man is very clever. He came quietly and peaceably with his religion. We were amused at his foolishness and allowed him to stay. Now he has won our brothers, and our clan can no longer act like one. He has put a knife on the things that held us together and we have fallen apart.

What is now proved was once only imagined.

I don't look on poetry as closed works. I feel they're going on all the time in my head and I occasionally snip off a length.

That men do not learn very much from the lessons of history is the most important of all the lessons that history has to teach.

Science is what we have learned about how to keep from fooling ourselves.

The most savage controversies are those about matters as to which there is no good evidence either way.

If the facts don't fit the theory, change the facts.

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

Knowing is not enough; we must apply. Willing is not enough; we must do.

Technology is just a tool. In terms of getting the kids working together and motivating them, the teacher is the most important.

A cynic is a man who knows the price of everything, and the value of nothing.

I am a part of everything that I have read.

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.

No man's knowledge here can go beyond his experience.

I had rather excel others in the knowledge of what is excellent, than in the extent of my power and dominion

The highest result of education is tolerance.