“In a way, in our contemporary world view, it’s easy to think that science has come to take the place of God. But some philosophical problems remain as troubling as ever. Take the problem of free will. This problem has been around for a long time, since before Aristotle in 350 B.C. St. Augustine, St. Thomas Aquinas, these guys all worried about how we can be free if God already knows in advance everything you’re gonna do.