We will make electricity so cheap that only the rich will burn candles.

I have never seen the slightest scientific proof of the religious ideas of heaven and hell, of future life for individuals, or of a personal God.

I never did anything by accident, nor did any of my inventions come by accident; they came by work.

Genius is not inspired. Inspiration is perspiration.

The doctor of the future will give no medication, but will interest his patients in the care of the human frame, diet and in the cause and prevention of disease. ~

I start where the last man left off.

Radio is just a fashion contrivance that will soon die out. It is obvious that there never will be invented a proper receiver!