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

I decided to teach because I think that any person who studies philosophy has to be involved actively.

It is better to know how to learn than to know.

God created man in His own image, says the Bible; philosophers reverse the process: they create God in theirs.

For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.

Science is a rising force, It is creating a new world about us. It needs to be watched and pressed into service, and in any case, it would be courting disaster to ignore it.

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

The real solution lies in a world in which charity will have become unnecessary.

Imagination is more important than knowledge.

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

Civilization is a race between disaster and education.

The progressive development of man is vitally dependent on invention.

The deepest sin against the human mind is to believe things without evidence.

The first principle is that you must not fool yourself and you are the easiest person to fool.

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

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

My weapon is literature

Know what you are talking about.

A witty saying proves nothing.

I cannot live without books.

What is freedom of expression? Without the freedom to offend, it ceases to exist.