I. The devil's wickednessin leading men astray is now counteracted by the work of redemption in restoring them to the truth
God's mercy and justice, dearly-beloved, has in loving-kindness disclosed to us through our Lord Jesus Christ's teaching, the manner of His retributions, as they have been ordained from the foundation of the world, that accepting the significance of facts we might take what we believe will happen, to have, as it were, already come to pass. For our Redeemer and Saviour knew what great errors the devil's deceit had dispersed throughout the world and by how many superstitions he had subjected the chief part of mankind to himself.
But that the creature formed in God's image might not any longer through ignorance of the Truth be driven on to the precipice of perpetual death, He inserted in the Gospel-pages the nature of His judgment that it might recover every man from the snares of the crafty foe; for now all would know what rewards the good might hope for and what punishments the evil must fear. For the instigator and author of sin in order first to fall through pride and then to injure us through envy, because “he stood not in the Truth” put all his strength in lying and produced every kind of deceit from this poisoned source of his cunning, that he might cut off man's devout hopes from that happiness which he had lost by his own uplifting, and drag them into partnership with his condemnation, to whose reconciliation he himself could not attain.
Whoever therefore among men has wronged God by his wickednesses, has been led astray by his guile, and depraved by his villainy. For he easily drives into all evil doings those whom he has deceived in the matter of religion. But knowing that God is denied not only by words but also by deeds, many whom he could not rob of their faith, he has robbed of their love, and by choking the ground of their heart with the weeds of avarice, has spoiled them of the fruit of good works, when he could not spoil them of the confession of their lips.
Source: Sermons (New Advent)