My alma mater was books, a good library.... I could spend the rest of my life reading, just satisfying my curiosity.

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

To every action there is always an equal and opposite or contrary, reaction

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

Human behavior flows from three main sources: desire, emotion, and knowledge

Books! I dunno if I ever told you this, but books are the greatest gift one person can give another.

If you can't explain it simply, you don't understand it well enough.

I have just three things to teach: simplicity, patience, compassion. These three are your greatest treasures.

There is no authority who decides what is a good idea.

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

Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it.

The progressive development of man is vitally dependent on invention.

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

All stable processes we shall predict. All unstable processes we shall control.

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

The only true wisdom is in knowing you know nothing.

Real learning comes about when the competitive spirit has ceased.

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

Don't learn to do, but learn in doing.

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

Free the child's potential, and you will transform him into the world.