Gwenaëlle Aubry calls Aristotle’s god of pure act is “a god without power, but nonetheless not a weak god” (Dieu san la puissance, p. 9, my translation). Pure act has an efficacy in the world that is not that of efficient causality, but rather that of the final causality that is the efficacy of the Aristotelian Good. She intriguingly connects this efficacy with the potentiality in things that is Aristotle’s very different meaning for the same word as “power”.
She builds a contrasting account of how for Plotinus the One — identified with the Platonic Good — is the “power of all”, that is to say the power behind all that is. To be “the power behind all that is” is not to be omnipotent in the sense of Philo and later theologians, but it is still very different from being pure act. Here the first principle of all things is a power, whereas the first principle for Aristotle according to Aubry is a pure end that is not involved with power at all, but is rather an attractor for potentialities. Plotinus wants the end of all things to be a power at the origin of all things.
“Power of” is very different from “power over”, and in Plato and Plotinus it is the Good that is the ultimate power. But according to Aubry, treating the first principle as a power at all set the stage for views that put power first in the order of explanation, ahead of the good.
In Genèse du dieu souverain she says that Augustine explicitly put divine omnipotence before divine goodness in his account of God. We have moved from “the Good is the power of all” to “the Almighty is good”.
Although Leibniz claims most theologians agree with him that God wills things because they are good, and that things are not just good because God wills them so, Aubry claims that affirming omnipotence means putting power first in the order of explanation.
Regardless of even saintly intentions, putting power first in the order of explanation is an inauspicious move for ethics.