Date: 1696

"Imagine two clocks or watches which agree perfectly ... Put now the soul and the body in place of these two clocks; their accordance may be brought about by one of these three ways."

— Leibniz, Gottfried Wilhelm (1646-1716)

Date: 1714

If we imagine a "machine whose structure makes it think, sense, and have perceptions" enlarged to the size of a mill, upon "inspecting its interior, we will only find parts that push one another, and we will never find anything to explain a perception"

— Leibniz, Gottfried Wilhelm (1646-1716)