Chapter 6 of book Lambda of Aristotle’s Metaphysics takes chapter 5’s unification of eternal and corruptible sensible substance as a starting point, and now inquires into the relation between sensible, movable substance as a whole and unmoved substance. We’ve been following the detailed development of Gwenaëlle Aubry’s provocative non-traditional interpretation of the distinctive features of Aristotle’s account.
“The simple and necessary substance is not needed in order to give an account of the substances that, insofar as they are mixed from act and in-potentiality, can either be or not be, but in order to give an account of movement insofar as it cannot not be. The first question for Aristotle is not ‘why is there being?’ but ‘why is there movement?’, or, more precisely, ‘why is there always movement?'” (Aubry, Dieu san la puissance, 2nd ed., ch. 5, p. 178, emphasis added, my translation throughout).
“Whereas the theology of omnipotence is a response to the question of the emergence of being, the theology of pure act in effect is a response to the question of the eternity of movement. The god of Aristotle thus provides a reason for the most manifest, for the most evident. It is not the ground — or the bottomlessness — of the mystery of being, more mysterious than the being it serves to explain, but the reason of the most immediate, most apparent phenomenon. Movement, in effect, is the first given” (ibid).
“[A]mong the different species of movement, the priority comes back to local movement. The latter is indeed anterior to genesis: ‘It is impossible that generation should be first’. Generation is only first in the order of the individual, since the latter must exist in order to move. But in order for it to come into being, it is necessary for another being to have preexisted it which was in movement, and the same for this last. Thus it is not movement that comes to be, but coming to be that presupposes an antecedent movement and being” (pp. 178-179, emphasis in original).
She quotes from Generation and Corruption book II chapter 10, “For it is far more reasonable that what is should cause the coming-to-be of what is not, than that what is not should cause the being of what is. Now that which is being moved is, but that which is coming-to-be is not: hence motion is prior to coming-to-be” (Collected Works, Barnes ed., vol. 1, p. 550, emphasis in original).
“There is no first instant of movement. Movement cannot not have always been” (Aubry, p. 179). She notes that the Metaphysics does not contain the demonstration of this. Aristotle’s actual demonstration of the eternity of movement occurs in book VIII of the Physics, and basically consists in adding an indefinite regress to arguments like those we have just seen.
“Lambda 6 in effect establishes that the principle of such a movement must be not power but act. We have already seen Aristotle’s insistence here on underlining, as in book capital Alpha, the originality of such a thought of the principle. The argument works in a regressive way, establishing successively that the principle of eternal movement cannot be conceived as a power (dunamis), not even as an active or acting power, but must be such that its very substance is act, he ousia energeia. Its stages, let us recall, are the following:”
“–to give an account of movement, it is not sufficient to assert a moving or efficient (kinetikon e poietikon) capacity, if it does not act (me energoun); for it is possible to have a power without acting (endekhetai gar to dunamin ekhon me energein)”
“–nonetheless, even supposing that the principle acts (ei energesei), we cannot give an account of eternal movement if its ousia is dunamis. In effect, if that which has a power has the possibility of not acting, that which is in-potentiality has the possibility of not being (endekhetai gar to dunamei on me einai)”
“–it follows therefore that there is a principle such that its ousia is act, he ousia energeia” (p. 180).
She notes the striking parallelism of Aristotle’s phrases, but also finds a progression between the two formulae, corresponding to a transition between the “kinetic” and “ontological” senses of dynamis that she has often remarked upon.
“As with that from power to in-potentiality, the transition is thus effectuated from action to act: the principle of eternal movement must be conceived not only as an always active and acting power, but as an act. The argument relies only on the ontological sense of [pure] energeia, understood as that mode of being which is subtracted from the possibility of non-being” (p. 181).
“Ultimately we find posed as the condition of eternal movement, a being of which the ousia is energeia. But to say this is also to say, as the two moments of the demonstration underline, that from this substance is excluded every form of power: as much active power as in-potentiality. Thus — and it is again necessary to underline the force, and the paradox, of such a thesis: the very condition of the efficacity of the principle resides in its absence of power. It is not because it is all-powerful or fully active, but indeed because it is fully act that it is maximally efficacious, since it is the principle of eternal movement” (ibid, emphasis in original).
“That the principle (or principles) of eternal movement are act is deduced again from two necessary properties: eternity and immateriality. We verify equally the claim of Lambda 5: act serves to name not only (as Theta 8 established) the mode of being of the necessary and the eternal, but also that of form or the immaterial” (p. 183).
She goes on to contrast this argument with the more limited concerns of Aristotle’s demonstration of the need for an unmoved mover in the Physics.
“Decisive for the demonstration of Lambda 6, the ontological sense is on the other hand absent from that of Physics VIII. The latter utilizes not the schema of finality and the correlation of in-potentiality and act, but that of efficiency and of the correlation of powers…. [T]he text of Physics VIII considers at length the Platonic hypothesis according to which the first principle can be a self-mover. It is concerned to demonstrate that even a self-mover must have a mover and a moved, and finally to establish that at the origin of change there must be an unmoved mover. But the relation of the unmoved mover to that which it moves is thought on the model of efficiency…. The hypothesis, foundational for Lambda 6, of an unactualized power, or a power that is able to not act, is not envisaged. The action of the mover on the moved is described [in Physics VIII] as that of a mechanical force, working by contact with the first moved thing” (ibid).
In Physics VIII, Aristotle even speaks of a temporally infinite power (dynamis apeiros) behind what is commonly translated as “eternal” movement. In Aubry’ s paraphrase, “But an infinite power cannot reside in a finite body, so the first mover must be thought as being indivisible, without parts, and without magnitude” (p. 184).
Physics VIII is after all concerned with the roots of ordinary physical motion, so it is reasonable that it focuses on the “kinetic” sense of dynamis. It does seem that Metaphysics Lambda refers to Physics VIII’s demonstration of the need for an unmoved mover, so it is reasonable to assume that Lambda represents a later development.
It should not be surprising that Lambda, from a different and later point of view, makes new arguments about the first cause that are not in Physics VIII, and corrects some statements of the latter on its nature. Aubry does not comment on this discrepancy, but is content to do her due diligence in pointing it out. We saw earlier, however, that in Physics III Aristotle does also subordinate the kinetic sense of dynamis to what she calls the ontological one of in-potentiality.
Next in this series: Ousia Energeia
The Postmodern Peripatetic 