Nietzsche argued that genius is more frequent than we think, but that something else is missing for its realization ("the five hundred hands"):

> In the realm of genius, might the “Raphael without hands” — the term understood in its broadest sense — be not the exception, but the rule? — Genius is perhaps not so rare after all: but the five hundred hands it needs to tyrannize the καιρὁς, “the right time” — to seize chance by the scruff of the neck! [0]

[0] http://www.nietzschesource.org/#eKGWB/JGB-274 (translated from German)