At first God deemed it sufficient to inscribe the natural law, or the Decalogue, upon the hearts of men; but afterwards He found it necessary to bridle, with the yoke of the Mosaic law, the desires of the Jews, who were abusing their liberty; and even to add some special commands, because of the hardness of their hearts.
Ante-Nicene Fathers — American Roberts / Donaldson / Coxe edition, Volume I · Against Heresies — unspecified — eng