The Unmoved Mover: God in Aristotle’s Metaphysics

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For millennia, human beings have pondered the existence of supreme beings. The origin of this all-too-human yearning for such divine entities stems in part from our desire to grasp the truth of the cosmos we inhabit. One part of this universe physically surrounds us and, at the end of our lives, consumes us entirely, and so we return from whence we came. Yet there is another, arguably more eternal, part of the cosmos that, in some ways, is separable from the transient, material world we so easily perceive but that, in other ways, is inextricably linked to it by unexplored, divinable forces. The argument of Aristotle’s Metaphysics is not that this worldview is provable or disprovable; the mere fact we are able to reason about abstract objects without having to perceive them is evidence enough of this order. Rather, Aristotle attempts to tackle some of the most fundamental questions of human experience, and at the crux of this inquiry is his argument for the existence of an unmoved mover. For Aristotle, all things are caused to move by other things, but the unreasonableness of this going on ad infinitum means that there must eventually be an ultimate mover who is himself unmoved. Not only does he put forth this argument successfully, but he also implies why it must hold true for anyone who believes in the ability to find truth by philosophy.

Book XII of the Metaphysics opens with a clear statement of its goal in the first line of Chapter One: to explore substances as well as their causes and principles. With this idea in mind, Chapter One delineates the three different kinds of substances: eternal, sensible substances; perishable, sensible substances; and immovable substances. The sensible substances are in the realm of natural sci...

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...e ultimate cause of everything? While its minor problems are resolved quite easily, Aristotle’s argument for the unmoved mover is predicated on a premise of unknown stability: philosophy. At the heart of the issue is the very nature of philosophy itself and its ability to tackle questions of any magnitude. If everything is knowable, and philosophy is the path to knowledge, then everything must be knowable through philosophy, yet the ad infinitum paradox Aristotle faces is one that shows that the weakest part of his argument is the fact it relies on the abovementioned characteristics of philosophy. If any one of those is wrong, his proof crumbles and the timeless God in which he believes goes along with it, but if they are all right, then there is one God, immovable and actuality, for as Aristotle says, “The rule of many is not good; let there be one ruler” (1076a).

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