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In nature there are never two beings which are perfectly alike and in
which it is not possible to find an internal difference, or at least a
difference founded upon an intrinsic quality.

Es gibt in der Natur niemals zwei Wesen, die einander vollkommen gleichen und bei denen sich nicht ein innerer oder auf eine innere Bestimmtheit gegr√ľndeter Unterschied entdecken liesse.

Gottfried Wilhelm Leibniz, Monadologie, 9, 1714