More than sixteen hundred years since his conversion, Augustine towers over Western history as arguably the most important person outside of Scripture. Augustine's teachings—that God is Trinitarian and holy, that people are evil by the choice of their own free will and born with a sin nature, and that people can only be saved by grace from God that is granted because he predestinated them—are the hallmarks of orthodoxy; what is often called Calvinistic Christian belief is really in many ways Augustinian belief, which is also simply biblical belief. A millennium later, the entire Protestant Reformation exploded in part because of Augustine's lasting influence on men such as John Calvin and Martin Luther, and today we are still benefiting from his teaching. Anyone wanting to learn more about Augustine will find an overwhelming number of resources by a Google or Amazon search.