If people are good only because they fear punishment, and hope for reward, then we are a sorry lot indeed.

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

If we knew what it was we were doing, it would not be called research, would it?

If you are out to describe the truth, leave elegance to the tailor.

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

Imagination is everything. It is the preview of life's coming attractions.

Imagination is more important than knowledge.

In order to be an immaculate member of a flock of sheep, one must above all be a sheep oneself.

Information is not knowledge.

Intellectual growth should commence at birth and cease only at death.

Isn't it strange that I who have written only unpopular books should be such a popular fellow?

It gives me great pleasure indeed to see the stubbornness of an incorrigible nonconformist warmly acclaimed.

It has become app0allingly obvious that our technology has exceeded our humanity.