Imagination is more important than knowledge.

The first principle is that you must not fool yourself and you are the easiest person to fool.

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

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

The task of a writer is not to solve the problem but to state the problem correctly.

Books are for people who wish they were somewhere else.

Better know nothing than half-know many things.

The knowledge of all things is possible

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.

Dare to think for yourself.

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

Although modesty is natural to man, it is not natural to children. Modesty only begins with the knowledge of evil.

The ability to observe without evaluating is the highest form of intelligence.

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

Never help a child with a task at which he feels he can succeed.

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

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

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.

Knowledge becomes evil if the aim be not virtuous.

Education is the ability to listen to almost anything without losing your temper or your self-confidence.

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