But in this mercifulness of God, dearly beloved, the greatness of which towards us we cannot explain, Christians must be extremely careful lest they be caught again in the devil’s wiles and once more entangled in the errors which they have renounced. For the old enemy does not cease to “transform himself into an angel of light,” and spread everywhere the snares of his deceptions, and make every effort to corrupt the faith of believers. He knows whom to ply with the zest of greed, whom to assail with the allurements of the belly, before whom to set the attractions of self-indulgence, in whom to instil the poison of jealousy: he knows whom to overwhelm with grief, whom to cheat with joy, whom to surprise with fear, whom to bewilder with wonderment: there is no one whose habits he does not sift, whose cares he does not winnow, whose affections he does not pry into: and wherever he sees a man most absorbed in occupation, there he seeks opportunity to injure him. Moreover he has many whom he has bound still more tightly because they are suited for his designs, that he may use their abilities and tongues to deceive others. Through them are guaranteed the healing of sicknesses, the prognosticating of future events, the appeasing of demons and the driving away of apparitions. They also are to be added who falsely allege that the entire condition of human life depends on the influences of the stars, and that that which is really either the divine will or ours rests with the unchangeable fates. And yet, in order to do still greater harm, they promise that they can be changed if supplication is made to those constellations which are adverse. And thus their ungodly fabrications destroy themselves; for if their predictions are not reliable, the fates are not to be feared: if they are, the stars are not to be venerated.