Matthew 19:4

4. He answered Our Lord’s answer really coincides with neither party. Schammai is indeed in the right in maintaining the stricter view of marriage obligation. His views are founded in absolute right. But then he is wrong in maintaining that the letter of the Mosaic law does maintain the highest strictness of the divine right on this subject. From the hardness of their hearts Moses did permit to the Jews, though not enjoin, a practice which was not absolutely right. A truly pure man could not avail himself of the permission. Have ye not read Our Lord here quotes the book of Genesis as a divine authority. We thus prove the Old Testament by the New. If Christ was the Son of God, Moses was the servant of God. If Christ’s words had a divine authority, then Moses was also inspired. Made them male and female He made the race male and female, with the divine intention that marriage should exist. And by still maintaining the race as divided into two sexes, he shows that marriage is a permanent and natural institution. And as he made one for one, and no more, so the marriage of a single man with a single woman is a law of the race. And since, by some mysterious law, the two sexes are perpetually preserved in an approximate equality in point of number, it is plain that the permanent marriage of one man with one woman is the permanent and universal law of nature. Polygamy, as well as capricious divorce, is a violation of natural law.