Against Celsus 1.4

Let us see also how he thinks he can slander our moral teaching on the ground that it is shared with the other philosophers and is not a venerable or new doctrine. To this we must say that, for those who teach a just judgment of God, punishment for sins would have been ruled out if all did not have, according to the common notions, a sound preconception about moral matters. So it is no wonder that the same God has sown in the souls of all human beings what he taught through the prophets and the Savior, so that every human being may be without excuse at the divine judgment, having the purpose "of the law written" in his own heart. This the Scripture hinted at in what the Greeks think a myth, when it portrayed God writing the commandments with his own "finger" and giving them to Moses, which the wickedness of those who made the calf "broke"—as if it were saying that the flood of sin washed them away. The second time God wrote them again and gave them after Moses had hewn stones, as though the prophetic word were preparing the soul, after the first sin, for a second writing of God.