Causal Powers as Accidents: Thomas Aquinas's View.

I argue that Thomas Aquinas maintains the view that (created) powers are accidental to their bearers not because powers pertain to bearers with limited essences, but because their bearers have limited actual being. Power tracks not only the essence of something but also its actual existence. Things have powers that are causally relevant when these things exist, that is, the nature of a power is determined by a thing's essence, but the actual being of the thing of that essence accounts for the limitations of this power and for the extent to which a power can have causal effects. [ABSTRACT FROM AUTHOR]