Above all, never think you're not good enough. Never think that. In life people will take you at your own reckoning.

— Isaac Asimov

A couple of months ago I had a dream, which I remember with the utmost clarity. (I don't usually remember my dreams.) I dreamed I had died and gone to Heaven. I looked about and knew where I was-green fields, fleecy clouds, perfumed air, and the distant, ravishing sound of the heavenly choir. And there was the recording angel smiling broadly at me in greeting. I said, in wonder, "Is this Heaven?" The recording angel said, "It is." I said (and on waking and remembering, I was proud of my integrity), "But there must be a mistake. I don't belong here. Furthermore, I'm an atheist." "No mistake," said the recording angel. "But as an atheist how can I qualify?" The recording angel said sternly, "We decide who qualifies. Not you." "I see," I said. I looked about, pondered for a moment, then turned to the recording angel and asked, "Is there a typewriter here that I can use?" The significance of the dream was clear to me. I felt Heaven to be the act of writing, and I have been in Heaven for over half a century and I have always known this.

— Isaac Asimov

After a long time, I decided that the Three Laws govern the manner in which my positron pathways behave. At all times, under all stimuli the Laws constrain the direction and intensity of positron flow along those pathways so that I always know what to do. Yet the level of knowledge of what to do is not always the same. There are times when my doing-as-I-must is under less constraint than at other times. I have always noticed that the lower the positronomotive potential, then the further removed from certainty is my decision as to which action to take. And the further removed from certainty I am, the nearer I am to ill being. To decide an action in a millisecond rather than a nanosecond produces a sensation I would not wish to be prolonged. What then, I thought to myself, madam, if I were utterly without Laws, as humans are? What if I could make no clear decision on what response to make to some given set of conditions? It would be unbearable, and I do not willingly think of it.

— Isaac Asimov

Agitation from the other side of the desk.“No—now you must take this phlegmatically. You had hoped you would qualify. You had feared you would not. Actually, both hope and fear are weaknesses. You knew you would qualify, and you hesitate to admit the fact because such knowledge might stamp you as cocksure and therefore unfit. Nonsense! The most hopelessly stupid man is he who is not aware that he is wise. It is part of your qualification that you knew you would qualify.” Relaxation on the other side of the desk.“Exactly. Now you feel better, and your guard is down. You are fitter to concentrate and fitter to understand. Remember, to be truly effective, it is not necessary to hold the mind under a tight, controlling barrier which to the intelligent probe is as informative as a naked mentality. Rather, one should cultivate an innocence, an awareness of self, and an unselfconsciousness of self which leaves one nothing to hide. My mind is open to you. Let this be so for both of us.

— Isaac Asimov

Aimless extension of knowledge, however, which is what I think you really mean by the term curiosity, is merely inefficiency. I am designed to avoid inefficiency.

— Isaac Asimov

All evil is good become cancerous.

— Isaac Asimov

All normal life, Peter, consciously or otherwise, resent domination. If the domination is by an inferior, or by a supposed inferior, the resentment becomes stronger.

— Isaac Asimov

All right, Schwartz, tackle my mind now. Go as deep as you want. I was born on Barony in the Sirius Sector. I lived my life in an atmosphere of anti-Terrestrialism in the formative years, so I can't help what flaws and follies lie at the roots of my subconscious. But look on the surface and tell me if, in my adult years, I have not fought bigotry in myself. Not in others; that would be easy. But in myself, and as hard as I could.

— Isaac Asimov

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

— Isaac Asimov

All sorts of computer errors are now turning up. You'd be surprised to know the number of doctors who claim they are treating pregnant men.

— Isaac Asimov