Gottfried Wilhelm Leibniz
The soul follows its own laws, and the body likewise follows its own laws; and they agree … the pre-established harmony between all substances, since they are all representations of one and the same universe. … Souls act according to the laws of final causes through appetitions, ends, and means. Bodies act according to the laws of efficient causes or motions. And the two realms, that of efficient causes and that of final causes, are in harmony with one another.
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1714 · The Monadology, §§78–79 — the pre-established harmony of soul and body
Checked word-for-word against The Monadology and Other Philosophical Writings · 2026-07-18