 Kilwardby argues that PPM is naturally endowed/pregnant (gravida) with active potencies that, once set in motion by the action of an external agent, co-operate in change and become fully  actual.[8]  An active potency “is called potency because it is ordained to actuality and active because it is something of a form” (E 3, 30). Matter strives for form and the action of striving entails the existence already of something of form, which is the active potency. Potentiality is therefore taken not as mere receptivity of form but as an active appetite for (full) actuality. An active potency is a form in an incomplete state because it was born to make itself actual (nata est facere se in  actu).[9]