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.

Education is a human right with immense power to transform. On its foundation rest the cornerstones of freedom, democracy and sustainable human development.

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

Books are as useful to a stupid person as a mirror is useful to a blind person.

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

The progressive development of man is vitally dependent on invention.

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

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

Necessity is the mother of invention.

Education is a system of imposed ignorance.

The only good is knowledge and the only evil is ignorance.

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

When I am attacked by gloomy thoughts, nothing helps me so much as running to my books. They quickly absorb me and banish the clouds from my mind.

Better know nothing than half-know many things.

Investigate, educate and organize.

Study hard what interests you the most in the most undisciplined, irreverent and original manner possible.

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

Suddenly degrees aren't worth anything. Isn't that true? When I was a student, if you had a degree, you had a job. If you didn't have a job it's because you didn't want one. And I didn't want one, frankly.

I like poems you can tack all over with a hammer and there are no hollow places.

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

A witty saying proves nothing.