Just when I thought there wasn't room enough for another thought in my head, I had this great idea.

Opinion is the medium between knowledge and ignorance.

Education is the most powerful weapon which you can use to change the world.

The fullness of knowledge only comes through the awareness of ignorance.

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

When you know better you do better.

Investigate, educate and organize.

Civilization is a race between disaster and education.

Necessity is the mother of invention.

The man who is fond of books is usually a man of lofty thought, and elevated opinions.

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

Knowing others is wisdom, knowing yourself is Enlightenment.

I learned very early the difference between knowing the name of something and knowing something.

Books are for people who wish they were somewhere else.

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

Education is a system of imposed ignorance.

You can never be overdressed or overeducated.

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

Language is courage: the ability to conceive a thought, to speak it, and by doing so to make it true.

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

Patience is a virtue, and I'm learning patience. It's a tough lesson.