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

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

I have no special talents. I am only passionately curious.

If one cannot enjoy reading a book over and over again, there is no use in reading it at all.

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

You can never learn less, you can only learn more.

Don't worry that children never listen to you; worry that they are always watching you.

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

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

I do not know how to teach philosophy without becoming a disturber of the peace.

Imagination is more important than knowledge.

Dare to think for yourself.

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

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

No power and no treasure can outweigh the extension of our knowledge.

The reading of all good books is like conversation with the finest men of past centuries.

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

The idea is to try to give all the information to help others to judge the value of your contribution; not just the information that leads to judgment in one particular direction or another.

I am a part of everything that I have read.

Evil being the root of mystery, pain is the root of knowledge.

I am indebted to my father for living, but to my teacher for living well.