Nature does not make all great men, more than all other men, in the self-same mould.
 Thomas Carlyle, On Heroes, Hero-Worship, and The Heroic in History (1841). copy citation

Context

“they had done things a little harder than these! Burns, a gifted song-writer, might have made a still better Mirabeau. Shakspeare,—one knows not what he could not have made, in the supreme degree. True, there are aptitudes of Nature too. Nature does not make all great men, more than all other men, in the self-same mould. Varieties of aptitude doubtless; but infinitely more of circumstance; and far oftenest it is the latter only that are looked to. But it is as with common men in the learning of trades. You take any man, as yet a vague capability of a man, who could be any kind of craftsman;” source