Aristotle's Metaphysics: Unmoved Mover and Four Causes
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The Unmoved Mover and Pure Act
For Aristotle, if something is moving, it is because the movement was previously in potentiality, and it was another substance that communicated it into actuality. The chain of things that move and are moved cannot be infinite. Therefore, the existence of a first mover is necessary—one that moves without being moved itself: the Unmoved Mover.
The Concept of Potentiality and Actuality
This concept is reached by considering the Mover as a pure form, already realized as Actus Purus (Pure Act). The substrate is the realm of possibility. Aristotle called this conceptual substrate First Matter, which is pure potentiality, pure plasticity without specific form or concretion.
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