One of the greatest theologians in the history of the church. He was influential in the development of the Western church’s understanding of the doctrines of the Trinity, sin, predestination and the church. His teachings or Augustinianism is a system of thought essentially starts with the complete sinfulness of humankind (depravity), which leaves humans unable to respond in faith toward God. In keeping with this, Augustinianism asserts that God predestines those who are enabled to repent and believe. Many believe that Augustine had the greatest influence on John Calvin’s life.