Active executive power, not passive or ad intra
But by the name of power here we do not understand passive power, which cannot fall upon God as pure act, nor the act by which God inwardly in Himself always acts from the necessary perfection of His nature, and therefore neither the power of generating and spirating, by which He acts naturally and inwardly: but active or executive power, by which He can work outwardly and, whenever it pleases Him, does work.
Under this operation we also will to comprise impeding, permitting, and ordering, which, with the intellect directing, the will commands. Nor do we attribute this to God in the notion by which Aristotle in Metaphysics V defines a principle of change into another according as it is other: for such active power belongs to created and finite being, in which act and power differ. But to God active power is attributed according to perfection, not according to participation, and in Him power and act are the same. Hence Richard of Saint Victor: It is certain that God is powerful by fullness of power, not by participation of power.
Latin
Verum potentiae nomine hic non intelligimus passivam potentiam, quippe quae in Deum, purum actum, cadere nequit, neque actum quo Deus intus in seipso e naturae suae necessaria perfectione semper agit, ac proinde neque potentiam generandi et spirandi, quippe qua naturaliter agit et ad intra: sed potentiam activam seu exsequentem, qua extrinsecus operari potest, et, quandocunque lubet, operatur. Sub qua operatione etiam impeditionem, permissionem, ordinationem comprehensam volumus, quam, dirigente intellectu, voluntas imperat. Neque hanc Deo tribuimus ea notione qua Aristoteles V. Metaph. finit, principium transmutationis in aliud secundum quod aliud: nam talis potentia activa competit enti creato et finito, in quo actus et potentia differunt. Deo autem potentia activa tribuitur secundum perfectionem, non secundum participationem, et in eo potentia et actus sunt idem. Hinc Richardus de Sancto Victore: Constans est Deum esse potentem potentiae plenitudine, non potentiae participatione.