The difference between machines and human beings is that human beings can be reproduced by unskilled labour.

You can't have it both ways. You can't have both free will and a benevolent higher power who protects you from yourself.

The greatest tragedy in mankind's entire history may be the hijacking of morality by religion. However valuable-even necessary-that may have been in enforcing good behavior on primitive peoples, their association is now counterproductive. Yet at the very moment when they should be decoupled, sanctimonious nitwits are calling for a return to morals based on superstition.

I will not be afraid because I understand ... And understanding is happiness.

If there are any gods whose chief concern is man, they can't be very important gods.

One orbit, with a radius of 42,000 kilometers, has a period of exactly 24 hours. A body in such an orbit, if its plane coincided with that of the Earth's equator, would revolve with the Earth and would thus be stationary above the same spot on the planet. It would remain fixed in the sky of a whole hemisphere ... [to] provide coverage to half the globe, and for a world service three would be required, though more could be readily utilized. (1945) [Predidicting geosynchronous communication satellites]

There were some things that only time could cure. Evil men could be destroyed, but nothing could be done with good men who were deluded.