The progressive development of man is vitally dependent on invention.

If there were no bad people, there would be no good lawyers.

Never help a child with a task at which he feels he can succeed.

Free the child's potential, and you will transform him into the world.

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

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

Real knowledge is to know the extent of one's ignorance.

Science is what we have learned about how to keep from fooling ourselves.

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

If help and salvation are to come, they can only come from the children, for the children are the makers of men.

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

The idea is to try to give all the information to help others to judge the value of your contribution; not just the information that leads to judgment in one particular direction or another.

There is nothing more awful, insulting, and depressing than banality.

I am indebted to my father for living, but to my teacher for living well.

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

It is what you read when you don't have to that determines what you will be when you can't help it.

When you know better you do better.

I don't look on poetry as closed works. I feel they're going on all the time in my head and I occasionally snip off a length.

Education is the best friend. An educated person is respected everywhere. Education beats the beauty and the youth.

I cannot live without books.

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