One of the most volatile controversies of the 4th century involved the doctrine of original sin. The combatants were the famous Bishop of Hippo, Aurelius Augustine, and the monk Pela gius.
Pelagius took offense at Augustine’s famous prayer, “Grant what thou commandest, and command what thou dost desire.”
Pelagius disagreed that it is in any way necessary for God to “grant” what he commands of us. Pelagius assumed that moral responsibility always carries with it moral ability. It would be unjust of God to require his creatures to do what they are unable to do in their own power.
If God requires moral perfection, then mankind must be able to achieve perfection. Though grace facilitates our quest for moral perfection, grace is not necessary for us to reach it.
Augustine argued that grace not only facilitates our efforts to obey God, but because of our fallen nature, grace is necessary.
Before the fall, the requirement for moral perfection was already present. The fall did not change the requirement, but it did change us. What was once a moral possibility became, without grace, a moral impossibility. Augustine’s view is rooted in his doctrine of original sin. As the debate escalated, Pelagius aimed his guns at this doctrine.
Denying original sin, Pelagius argued that human nature was created not only good, but incontrovertibly good. Human nature can be modified, but the modifications can be only “accidental,” not “essential.”
This terminology again reflects Aristotelian categories, whereby the word accidental does not mean “unintentional” but refers to changes that affect only the surface of something, not its deepest essence. Sin does not change our essential moral nature. We may sin, but we remain “basically good.”
The idea of mankind’s basic goodness is a basic tenet of humanistic philosophy. It also pervades evangelicalism. Many believe they are “basically good.”
At the heart of Pelagius’s concern in his debate with Augustine was a desire to protect the idea of man’s free will.
Man both obeys God and sins against him according to the activity of a free will. Adam was given free will, and his will was not affected by the fall.
Nor was guilt or fallen corruption transmitted to Adam’s descendants. According to Pelagius, Adam’s sin affected Adam and Adam alone.
There is no inherited condition of corruption known as original sin. Man’s will remains entirely free and retains the capacity for indifference, meaning it is not predisposed or inclined toward evil. All men are born free of any predisposition to sin. We are all born in the same moral condition as Adam enjoyed before the fall.
Augustine, on the other hand, argued that sin is universal. Man is incapable of elevating himself to the good without the work of God’s grace within.