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 Leibniz
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It follows from what we have just said, that the natural changes of monads come from an internal principle, since an external cause would be unable to influence their inner being.
- Gottfried Leibniz -
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I also take it as granted that every created thing, and consequently the created monad also, is subject to change, and indeed that this change is continual in each one.
- Gottfried Leibniz