Aktus Purus (Latyn vir “suiwer akt”) verwys na die idee dat God geen potensiaal of onvolledigheid in Hom het nie. Waar ‘n mens potensiaal het om te groei, te leer of te verander, is God reeds volkome – niks kan bygevoeg of verander word nie. Hy is volledig geaktualiseer in Sy wese. Hierdie konsep, afkomstig uit die Aristoteliaanse en Thomistiese tradisie, help om God se onveranderlikheid, ewigheid en volmaaktheid te verstaan: as suiwer akt, sonder enige onvervulde potensiaal, is God volkome en volledig in Homself.
Actus Purus (Latin for “pure act”) refers to the idea that God has no potentiality or incompleteness in Him. Where a human being has the potential to grow, learn, or change, God is already wholly complete – nothing can be added to or changed in Him. He is fully actualised in His being. This concept, originating from the Aristotelian and Thomistic tradition, helps us understand God’s immutability, eternity, and perfection: as pure act, without any unfulfilled potentiality, God is wholly and completely sufficient in Himself.