Let us still give special consideration to the formation
of concepts. Every word immediately becomes a concept,
inasmuch as it is not intended to serve as a reminder of the
unique and wholly individualized original experience to
which it owes its birth, but must at the same time fit
innumerable, more or less similar cases—which means,
strictly speaking, never equal—in other words, a lot of
unequal cases. Every concept originates through our
equating what is unequal. No leaf ever wholly equals
another, and the concept "leaf" is formed through an
arbitrary abstraction from these individual differences,
through forgetting the distinctions; and now it gives rise to
the idea that in nature there might be something besides the
leaves which would be "leaf"—some kind of original form
after which all leaves have been woven, marked, copied,
colored, curled, and painted, but by unskilled hands, so that
no copy turned out to be a correct, reliable, and faithful
image of the original form. — Nietzsche
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