5 The case of Adam, however, had no analogy with this, but was altogether different. For, having been beguiled by another under the pretext of immortality, he is immediately seized with terror, and hides himself; not as if he were able to escape from God; but, in a state of confusion at having transgressed His command, he feels unworthy to appear before and to hold converse with God. Now, “the fear of the Lord is the beginning of wisdom;” the sense of sin leads to repentance, and God bestows His compassion upon those who are penitent.
For [Adam] showed his repentance by his conduct, through means of the girdle [which he used], covering himself with fig-leaves, while there were many other leaves, which would have irritated his body in a less degree. He, however, adopted a dress conformable to his disobedience, being awed by the fear of God; and resisting the erring, the lustful propensity of his flesh (since he had lost his natural disposition and child-like mind, and had come to the knowledge of evil things), he girded a bridle of continence upon himself and his wife, fearing God, and waiting for His coming, and indicating, as it were, some such thing [as follows]: Inasmuch as, he says, I have by disobedience lost that robe of sanctity which I had from the Spirit, I do now also acknowledge that I am deserving of a covering of this nature, which affords no gratification, but which gnaws and frets the body.
And he would no doubt have retained this clothing for ever, thus humbling himself, if God, who is merciful, had not clothed them with tunics of skins instead of fig-leaves. For this purpose, too, He interrogates them, that the blame might light upon the woman; and again, He interrogates her, that she might convey the blame to the serpent. For she related what had occurred. “The serpent,” says she, “beguiled me, and I ate.” But He put no question to the serpent; for He knew that he had been the prime mover in the guilty deed; but He pronounced the curse upon him in the first instance, that it might fall upon man with a mitigated rebuke. For God detested him who had led man astray, but by degrees, and little by little, He showed compassion to him who had been beguiled.
Source: Adversus haereses (New Advent)