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

In mathematics you don't understand things. You just get used to them.

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

The delight of opening a new pursuit, or a new course of reading, imparts the vivacity and novelty of youth even to old age.

Real learning comes about when the competitive spirit has ceased.

Most people have never learned that one of the main aims in life is to enjoy it.

It isn't what we don't know that gives us trouble, it's what we know that ain't so.

An investment in knowledge pays the best interest.

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

What we know is a drop, what we don't know is an ocean.

They say a little knowledge is a dangerous thing, but it's not one half so bad as a lot of ignorance.

I cannot live without books.

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

Any sufficiently advanced technology is indistinguishable from magic.

Medicine is my lawful wife and literature my mistress; when I get tired of one, I spend the night with the other.

The schools ain't what they used to be and never was.

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

The direction in which education starts a man will determine his future in life

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

A man who has never gone to school may steal a freight car; but if he has a university education, he may steal the whole railroad.

I am a part of everything that I have read.