Real knowledge is to know the extent of one's ignorance.

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.

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

It is what you read when you don't have to that determines what you will be when you can't help it.

What sculpture is to a block of marble, education is to a human soul.

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

The progressive development of man is vitally dependent on invention.

It isn't what we don't know that gives us trouble, it's what we know that ain't so.

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

Education is our passport to the future, for tomorrow belongs to the people who prepare for it today.

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

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.

The highest result of education is tolerance.

A thought is an idea in transit.

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

Reading without reflecting is like eating without digesting.

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

The secret of life is not enjoyment but education through experience.

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

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

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