CTDC states that the sacrifice of Isaac, the ban of the Amalekites, and other OT moral horrors are the voice of God as the voice of conscience. Abraham was morally certain that (for example) to hold back the sacrifice of his son is to concede that his God is not worthy to be offered all goods. Again, Abraham becomes convinced beyond all doubt and after much reflection that to hold back what he loves most from sacrifice is to merely continue the sacrifice of Cain, or to concede that the Moabites alone recognize the true God. The revelation of the Ram on mount Moriah is the voice of God in the more traditional and straightforward sense, and not as conditioned by conscience.
The general lesson is thus apart from revelation, even the most prudent and pious will experience feeling morally bound to goods which are, in fact, monstrosities. Given the circumstances in which conscience finds itself, even the paradigm of holiness will be morally obliged (through conscience) to perform the gravest of evils. A fortiori, the conscience of the imperfect will bind us to a monstrosity every other week.