One would be hard pressed to identify a more important thinker for the Christian faith than St. Augustine. Other than the apostles, his understanding of the Scriptures has permeated the thought processes and theology of the church more deeply than anyone. In his polemic against that Pelgian thinker, Julian, Augustine makes a great argument for original sin and its transmission to all men through the father of the human race, Adam. Unfortunately, Augustine, in my view, brutalizes the meaning and proper practice of baptism by advocating that infants be baptized. Overall, this is a great read and one that is very helpful when thinking through issues pertaining to original sin and its transmission to all men through Adam.