A fire-eater must eat fire even if he has to kindle it himself.

He had read much, if one considers his long life; but his contemplation was much more than his reading. He was wont to say that if he had read as much as other men he should have known no more than other men.

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.” -R. Daneel Olivaw

Even as a youngster, though, I could not bring myself to believe that if knowledge presented danger, the solution was ignorance.

It is not so much that I have confidence in scientists being right, but that I have so much in nonscientists being wrong.

Science is a set of rules to keep us from telling lies to each other. All scientists really have is a reputation for telling the truth.

Democracy cannot survive overpopulation. Human dignity cannot survive it. Convenience and decency cannot survive it. As you put more and more people into the world, the value of life not only declines, but it disappears. It doesn't matter if someone dies.