It is to deny, what the history of the world tells us is true, to suppose that men of ambition and talents will not continue to spring up amongst us. And, when they do, they will as naturally seek the gratification of their ruling passion, as others have so done before them.
Source, in full
Often the portion of this passage on "Towering genius..." is quoted without any mention or acknowledgment that Lincoln was speaking of the need to sometimes hold the ambitions of such genius in check, when individuals aim at their own personal aggrandizement rather than the common good.