Knowledge becomes evil if the aim be not virtuous.

Evil being the root of mystery, pain is the root of knowledge.

I cannot live without books.

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

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

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

Science is not only a disciple of reason but, also, one of romance and passion.

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

The only true wisdom is in knowing you know nothing.

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

An investment in knowledge pays the best interest.

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

Education is an admirable thing, but it is well to remember from time to time that nothing that is worth knowing can be taught.

As we acquire more knowledge, things do not become more comprehensible but more mysterious.

Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.

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

If one cannot enjoy reading a book over and over again, there is no use in reading it at all.

Real learning comes about when the competitive spirit has ceased.

I cannot teach anybody anything. I can only make them think

Imagination is the source of every form of human achievement. And it's the one thing that I believe we are systematically jeopardizing in the way we educate our children and ourselves.

I am so clever that sometimes I don't understand a single word of what I am saying.