For a wise man, I have been told, once said, ‘Gratitude is best and most effective when it does not evaporate in empty phrases.’ But alas, my lady, I am but a mass of empty...

…We now know the basic rules governing the universe, together with the gravitational interrelationships of its gross components, as shown in the theory of relativity worked out between 1905 and 1916. We also know the...

Human beings sometimes find a kind of pleasure in nursing painful emotions, in blaming themselves without reason or even against reason.

All roads lead to Trantor, and that is where all stars end.

There is a single light of science, and to brighten it anywhere is to brighten it everywhere.

The laws of history are as absolute as the laws of physics, and if the probabilities of error are greater, it is only because history does not deal with as many humans as physics does...

Never let your sense of morals prevent you from doing what is right.

I don’t believe in an afterlife, so I don’t have to spend my whole life fearing hell, or fearing heaven even more. For whatever the tortures of hell, I think the boredom of heaven would...

It seems to me, Golan, that the advance of civilization is nothing but an exercise in the limiting of privacy.

Bible: Various portions of it, when properly interpreted, contain a code of behaviour which many men consider best suited to the ultimate happiness of mankind.

No sensible decision can be made any longer without taking into account not only the world as it is, but the world as it will be.

All right, Schwartz, tackle my mind now. Go as deep as you want. I was born on Baronn in the Sirius Sector. I lived my life in an atmosphere of anti-Terrestrialism in the formative years,...

Suppose that we are wise enough to learn and know—and yet not wise enough to control our learning and knowledge, so that we use it to destroy ourselves? Even if that is so, knowledge remains...

There is nothing your knife handlers can do in the way of rioting and demonstrating that will have any permanent effect as long as, in the extremity, there is an army equipped with kinetic, chemical,...

And [Asimov]’ll sign anything, hardbacks, softbacks, other people’s books, scraps of paper. Inevitably someone handed him a blank check on the occasion when I was there, and he signed that without as much as a...

I grow grandiose, which is a good sign I should become prosaic.

Any technological advance can be dangerous. Fire was dangerous from the start, and so (even more so) was speech – and both are still dangerous to this day – but human beings would not be...