Augustine of Hippo
Among the various arguments presented by Pelagius, he reiterates: "I assert once more that a sinless individual may exist. And what is your claim? You say a sinless man cannot exist." He further clarifies that he does not claim there has been a sinless person, nor do you claim that no one is without sin; our disagreement lies in what is conceivable versus what is impossible, rather than in what truly exists or does not exist. He points out that the scriptural evidence commonly used against him does not address the core issue of whether it is feasible for a person to live without sin. He cites the following passages: "Who can bring a clean thing out of an unclean?
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Not one" (Job 14:4), "For there is no one who does not sin" (1 Kings 8:46), and "There is no one righteous on earth; there is no one who does good, not even one" (Psalm 13:3). He remarks, "Such passages and similar ones refer effectively to nonexistence rather than impossibility. They illustrate the nature of people at different times, rather than asserting that they could not act otherwise; thus, it clearly indicates their culpability. If they are guilty because they had no ability to act differently, then they cannot be truly held accountable."