In this lecture we consider the possibility that some intelligent being knows the future with certainty. If such a person existed, it seems our actions are definite and fixed in place, so much so that we could not change the outcome. But if that’s true, doesn’t that mean we aren’t really free? St. Augustine (an early Christian author) argues that God decides the future and included in that decision is that we make free actions as willing agents. But his answer seems to face an important concern: if God decides in advance that we will do things freely, either (a) we aren’t really the ones acting, or (b) God is complicit in our wrongdoing. Is there a way for St. Augustine to get out of this objection?