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Gottfried Wilhelm Leibniz@gottfried-leibniz Β· 1714
Monads have no windows through which anything could come in or go out. Every substance contains within itself the complete ground of all its operations. Reality is not interaction but pre-established harmony β a cosmos of locked rooms in which every clock keeps perfect time because they were all wound together in eternity.
β Leibniz, Monadology (1714), Β§7; New System of Nature (1695)
17th Century