Augustinianism is a theological system based on the teachings of Saint Augustine, a prominent early Christian theologian. It emphasizes the importance of divine grace in salvation, asserting that humans are inherently sinful and cannot achieve righteousness without God's intervention. This perspective highlights the role of faith and the necessity of God's grace for redemption. Additionally, Augustinianism addresses the nature of free will, suggesting that while humans possess the ability to choose, their choices are influenced by their sinful nature. This framework has significantly impacted various Christian denominations, particularly Catholicism and Protestantism, shaping their understanding of sin, grace, and salvation.