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

If you can't explain it simply, you don't understand it well enough.

What sculpture is to a block of marble, education is to a human soul.

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

Many much-learned men have no intelligence.

Civilization is a race between disaster and education.

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

No man's knowledge here can go beyond his experience.

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

The whole of science is nothing more than a refinement of everyday thinking.

Show me a family of readers, and I will show you the people who move the world.

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

Just because I don't care doesn't mean I don't understand.

Opinion is the medium between knowledge and ignorance.

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

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

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

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

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.

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

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