Time is really the only capital that any human being has, and the only thing he can't afford to lose.
Thomas A. EdisonWhen I have fully decided that a result is worth getting I go ahead of it and make trial after trial until it comes.
Thomas A. EdisonUntil man duplicates a blade of grass, nature can laugh at his so called scientific knowledge.
Thomas A. EdisonWe have merely scratched the surface of the store of knowledge which will come to us. I believe that we are now, a-tremble on the verge of vast discoveries - discoveries so wondrously important they will upset the present trend of human thought and start it along completely new lines .
Thomas A. Edison