It is not good for a man to be too cognizant of his physical and spiritual mechanisms. Complete knowledge reveals limits to human possibilities, and the less a man is by nature limited in his purposes, the less he can tolerate limits.

Really, one of us ought to have the courage to call the experiment off and shoulder the responsibility for the decision, but the majority reckons that that kind of courage would be a sign of cowardice, and the first step in a retreat. They think it would mean an undignified surrender for mankind as if there was any dignity in floundering and drowning in what we don't understand and never will.

My pessimism (which, by the way, is far from absolute) originated with my despair in the lack of perfection to be found in human nature. I was attempting in my successive books to show the inevitable handicap of the human condition.

The first 90% of the job takes 90% of the time. The remaining 10% of the job requires another 90% of the time. The first condition of immortality is death.

There are no answers, only choices.

Art gives man a reminder that he is not just a consumer but a creator as well. It awakens in him the urge to struggle and perform great deeds; it fills him with the craving to pass on the Promethean fire to generations to come.

Man does not create gods, in spite of appearances. The times, the age, impose them on him.