The Ontology of naturalism knows nothing of active powers. The particulars that populate that ontology are, one and all, exhaustively characterized by passive liabilities with regard to their causal powers. A passive liability is such that, given the proper efficient cause, it is and, indeed, must be actualized. As such, the actualization of a passive liability is a passive happening, not an action. This fact about passive liabilities is what makes their owners bereft of the sort of first-moving, active spontaneity that is a necessary condition for the exercise of free will. ¶ All natural objects with causal powers posses them as passive liabilities. Again, these liabilities are triggered or actualized if something happens to the object and, once triggered, they can produce an effect. For example, dynamite has the power (passive liability) to explode if something is first done to it. And so on for all causes. They are, one and all, passive potentialities. There actualizations are mere happenings to the relevant object. ¶ But active power is different. In virtue of possessing active power, and agent may act, initiate change or motion, perform something, bring about an effect with nothing causing it to do so. Active power is not something admitted in the ontology of the hard sciences, period.