Haurietis Aquas §32

³² But it is only in the Gospels that we find definitely and clearly set out the new covenant between God and man; for that covenant which Moses had made between the people of Israel and God was a mere symbol and a sign of the covenant foretold by the prophet Jeremias. We say that this new covenant is that very thing which was established and effected by the work of the Incarnate Word Who is the source of divine grace. This covenant is therefore to be considered incomparably more excellent and more solid because it was ratified, not as in the past by the blood of goats and calves, but by the most precious Blood of Him Whom these same innocent animals, devoid of reason, had already prefigured: "The Lamb of God, who taketh away the sins of the world."(26)