These principles have given me a way of explaining naturally the union or rather the mutual agreement of the soul and the organic body. The soul follows its own laws, and the body likewise follows its own laws; and they agree with each other in virtue of the pre-established harmony between all substances, since they are all representations of one and the same universe.
from: The Monadology (Book 1714)
The Monadoloy is short book by Gottfried Leibinz covering the philosophy of simple substances called monads. Click on the link to read this work and get a glimpse of sixteenth century metaphysics.
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Gottfried Leibniz, 
The Monadology
Gottfried Leibniz, The Monadology
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