The system known as "Calvinism" (or Reformed Theology) has its roots in the writings of St. Augustine in the 4th century. Church historian, Philip Schaff, documents St. Augustine's beliefs in his introduction to the works of St. Augustine. "Augustin...asserts that divine grace is not conditioned on human worthiness, and maintains the doctrine of absolute predestination, … Continue reading 0. An Introduction to Calvinism