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

The recurrence of a phenomenon like Edison is not very likely. The profound change of conditions and the ever increasing necessity of theoretical training would seem to make it impossible. He will occupy a unique and exalted position in the history of his native land, which might well be proud of his great genius and undying achievements in the interest of humanity.

Of all the frictional resistances, the one that most retards human movement is ignorance, what Buddha called 'the greatest evil in the world.' The friction which results from ignorance ... can be reduced only by the spread of knowledge and the unification of the heterogeneous elements of humanity. No effort could be better spent.

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.

Every effort under compulsion demands a sacrifice of energy. I never paid such a price.

Our senses enable us to perceive only a minute portion of the outside world.

Each day we go to our work in the hope of discovering.