60 It should be added that Lot, the brother, that is the blood relation, of Abraham, is not to be ranked as equal to those of whom God says, "I am the God of Abraham, of Isaac, and of Jacob;" nor does he belong to those testified to in Scripture as having continued righteous to the end, although in Sodom he lived a pious and virtuous life, and showed a praiseworthy hospitality, so that he was rescued from the fire, and a land was given by God to his seed to dwell in, for the sake of his uncle Abraham.
On these accounts he is commended in Scripture— not for intemperance or incest. But when we find bad and good actions recorded of the same person, we must take warning from the one, and example from the other. As, then, the sin of Lot, of whom we are told that he was righteous previous to this sin, instead of bringing a stain on the character of God, or the truth of Scripture, rather calls on us to approve and admire the record in its resemblance to a faithful mirror, which reflects not only the beauties and perfections, but also the faults and deformities, of those who approach it; still more, in the case of Judah, who lay with his daughter-in-law, we may see how groundless are the reproaches cast on the narrative.
The sacred record has an authority which raises it far above not merely the cavils of a handful of Manichæans, but the determined enmity of the whole Gentile world; for, in confirmation of its claims, we see that already it has brought nearly all people from their idolatrous superstitions to the worship of one God, according to the rule of Christianity. It has conquered the world, not by violence and warfare, but by the resistless force of truth. Where, then, is Judah praised in Scripture? Where is anything good said of him, except that in the blessing pronounced by his father he is distinguished above the rest, because of the prophecy that Christ would come in the flesh from his tribe?
Source: Reply to Faustus the Manichaean (New Advent)