For centuries Augustine's theory of free will has been used to explain why God is not the author of evil and humans are morally responsible for sin. Yet, when he embraced the doctrines of unconditional election and operative grace, Augustine began modifying his theory of free will. His final works claim his evolved notion of free will remained consistent with his early view, but this claim has provoked significant debate. Some scholars take him at his word, interpreting his teachings on...