The day science begins to study non-physical phenomena, it will make more progress in one decade than in all the previous centuries of its existence.

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

My mother understood human nature better and never chided. She knew that a man cannot be saved from his own foolishness or vice by someone else's efforts or protests, but only by the use of his own will.

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.

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

The economic transmission of power without wires is of all-surpassing importance to man. By its means he will gain complete mastery of the air, the sea and the desert. It will enable him to dispense with the necessity of mining, pumping, transporting and burning fuel, and so do away with innumerable causes of sinful waste.

There is no subject more captivating, more worthy of study, than nature. To understand this great mechanism, to discover the forces which are active, and the laws which govern them, is the highest aim of the intellect of man.