Education is a system of imposed ignorance.

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

Dare to think for yourself.

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

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

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

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

Make it a rule never to give a child a book you would not read yourself.

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

Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.

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

I decided to teach because I think that any person who studies philosophy has to be involved actively.

All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.

A thought is an idea in transit.

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

Necessity is the mother of invention.

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

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

The only true wisdom is in knowing you know nothing.

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

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