Of God and His Creatures

That there is in God Active Power

As passive power, or passivity, follows upon being in potentiality, so active power follows upon being in actuality; for everything acts by being in actuality, and is acted upon by being in potentiality. But it belongs to God to be in actuality; and therefore there is suitably ascribed to Him active power, but not passive power.

Hence it is said: Thou art powerful, O Lord (Ps. lxxxviii, 9); and Thy power and thy justice, O God, are even to the highest heaven, in the wonders that thou hast made (Ps. lxx, 18, 19).

2.6 : That it belongs to God to be to other Beings the Principle of Existence
2.8 : That God's Power is His Substance