We ought first to know that there are no good works except those which God has commanded, even as there is no sin except that which God has forbidden. Therefore whoever wishes to know and to do good works needs nothing else than to know God's commandments. Thus Christ says, Matthew xix, "If thou wilt enter into life, keep the commandments." And when the young man asks Him, Matthew xix, what he shall do that he may inherit eternal life, Christ sets before him naught else but the Ten Commandments. Accordingly, we must learn how to distinguish among good works from the Commandments of God, and not from the appearance, the magnitude, or the number of the works themselves, nor from the judgment of men or of human law or custom, as we see has been done and still is done, because we are blind and despise the divine Commandments.