[A]ll knowledge is one. When a light brightens and illuminates a corner of a room, it adds to the general illumination of the entire room. Over and o….

Intelligence is an accident of evolution, and not necessarily an advantage..

To introduce something altogether new would mean to begin all over, to become ignorant again, and to run the old, old risk of failing to learn..

It is quite clear that as long as the nations of the world spend most of their energy, money, and emotional strength in quarreling with words and wea….

What I will be remembered for are the Foundation Trilogy and the Three Laws of Robotics. What I want to be remembered for is no one book, or no dozen….

People are entirely too disbelieving of coincidence. They are far too ready to dismiss it and to build arcane structures of extremely rickety substan….

Humanity has the stars in its future, and that future is too important to be lost under the burden of juvenile folly and ignorant superstition..

All roads lead to Trantor, says the old proverb, and that is where all stars end..

To any who know the star field well from one certain reference point, stars are as individual as people. Jump ten parsecs, however, and not even your….

There is as yet insufficient data for a meaningful answer..

Intuition is the art, peculiar to the human mind, of working out the correct answer from data that is, in itself, incomplete or even, perhaps, mislea….

Science is uncertain. Theories are subject to revision; observations are open to a variety of interpretations, and scientists quarrel amongst themsel….

When I feel difficulty coming on, I switch to another book I'm writing. When I get back to the problem, my unconscious has solved it..

There is no right to deny freedom to any object with a mind advanced enough to grasp the concept and desire the state. -(from "The Bicentennial Man) ….

There is no merit to discipline under ideal circumstances. I must have it in the face of death or it is worthless..

Life originated in the sea, and about eighty percent of it is still there..

There is no more desire to live past one's time than to die before it..

Where is the world whose people don't prefer a comfortable, warm, and well-worn belief, however illogical, to the chilly winds of uncertainty..

If my doctor told me I had only six minutes to live, I wouldn't brood. I'd type a little faster..

Although the time of death is approaching me, I am not afraid of dying and going to Hell or (what would be considerably worse) going to the populariz….

Having reached 451 books as of now doesn't help the situation. If I were to be dying now, I would be murmuring, "Too bad! Only four hundred fifty-one….