The progressive development of man [has as its] ultimate purpose the complete mastery of mind over the material world.

A century from now it will no more occur to a normal person to mate with a person eugenically unfit than to marry a habitual criminal.

In the twenty-first century, the robot will take the place which slave labor occupied in ancient civilization.

The idea came like a flash of lightning and in an instant the truth was revealed.

The practical success of an idea, irrespective of its inherent merit, is dependent on the attitude of the contemporaries. If timely it is quickly adopted; if not, it is apt to fare like a sprout lured out of the ground by warm sunshine, only to be injured and retarded in its growth by the succeeding frost.

It is a simple feat of scientific electrical engineering — only expensive — blind, faint-hearted, doubting world.

Peace can only come as a natural consequence of universal enlightenment.