Indeed every monad must be different from every other. For there are never in nature two beings, which are precisely alike, and in which it is not possible to find some difference which is internal, or based on some intrinsic quality.
Gottfried LeibnizGod's relation to spirits is not like that of a craftsman to his work, but also like that of a prince to his subjects.
Gottfried LeibnizTaking mathematics from the beginning of the world to the time when Newton lived, what he had done was much the better half.
Gottfried Leibniz