On Grace and Free Will Author:St. Augustine Saint Augustine of Hippo was one of the earliest Christian theologians and philosophers. Augustine's writings were critical to the development of Western Christianity. St. Augustine's most famous works include On Grace and Free Will, Confessions, and The City of God. In the book On Grace and Free Will, St. Augustine argues that we should be w... more »eary of how we balance maintaining both grace and free will. One should not be done at the expense of the other.« less