You may live to see man-made horrors beyond your comprehension.

If Mr. Edison had thought smarter he wouldn't sweat as much.

Of all the frictional resistances, the one that most retards human movement is ignorance.

What we now want is closer contact and better understanding between individuals and communities all over the earth, and the elimination of egoism and pride which is always prone to plunge the world into primeval barbarism and strife... Peace can only come as a natural consequence of universal enlightenment.

Today's scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality.

I predict that very shortly the old-fashioned incandescent lamp, having a filament heated to brightness by the passage of electric current through it, will entirely disappear.

If you only knew the magnificence of the 3, 6 and 9, then you would have the key to the universe.