What is the driving force behind salvation? Is it God’s sovereign will, enacting His efficacious grace upon the heart of man? Or is it the free will of man himself, choosing to accept the grace that has been extended to him? This is the age-old question behind the argument of sovereignty versus free will. Luis de Molina, a sixteenth century Jesuit theologian, believed that God, through His omniscience and omnipotence, can predestine an individual for salvation while keeping the free will of that individual intact. This system, known as Molinism, stands on three main principles: a wholly libertarian account of man’s free will, the conviction that the grace the Lord extends to complete salvific acts is not in itself intrinsically efficacious, and the assumption of the truth of the concept of Scientia media, or Middle Knowledge.