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.
Cowards die many times before their deaths; The valiant never taste of death but once. Of all the wonders that I yet have heard, It seems to me most strange that men should fear; Seeing that death, a necessary end, Will come when it will come.
On occasion we need to make a second effort - and a third effort, and a fourth effort, and as many degrees of effort as may be required to accomplish what we strive to achieve.
One should guard against preaching to young people success in the customary form as the main aim in life. The most important motive for work in school and in life is pleasure in work, pleasure in its result, and the knowledge of the value of the result to the community.