Firmness of purpose is one of the most necessary sinews of character, and one of the best instruments of success. Without it, genius wastes its efforts in a maze of inconsistencies.
The power of applying attention, steady and undissipated, to a single object, is the sure mark of superior genius.
Without any extraordinary effort of genius, I have discovered that nature was the same three thousand years ago as at present; that men were but men then as well as now; that modes and customs vary often, but that human nature is always the same. And I can no more suppose, that men were better, braver, or wiser, fifteen hundred or three thousand years ago, than I can suppose that the animals or vegetables were better than they are now.
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