Edison was by far the most successful and, probably, the last exponent of the purely empirical method of investigation. Everything he achieved was the result of persistent trials and experiments often performed at random but always attesting extraordinary vigor and resource. Starting from a few known elements, he would make their combinations and permutations, tabulate them and run through the whole list, completing test after test with incredible rapidity until he obtained a clue. His mind was dominated by one idea, to leave no stone unturned, to exhaust every possibility.
I do not deny that many appear to have succeeded in a material way by cutting corners and by manipulating associates, both in their professional and in their personal lives. But material success is possible in this world and far more satisfying when it comes without exploiting others.
But man is a fickle and disreputable creature and perhaps, like a chess-player, is interested in the process of attaining his goal rather than the goal itself.
Courage is not having the strength to go on, it is going on when you don't have the strength. Industry and determination can do anything that genius and advantage can do and many things that they cannot.
The artist... standing in the position of mediator between the world of his experience and the world of his dreams - 'a mediator, consequently gifted with twin faculties, a selective faculty and a reproductive faculty.' To equate these faculties was the secret of artistic success.