Matthew 19:6

God has joined by making man and woman one flesh; this then man may not put asunder, but God only. Man puts asunder, when from desire of a second wife the first is put away; God puts asunder, who also had joined, when by consent for the service of God we so have our wives as though we had them not. (1 Cor. 7:29.)

See a teacher's wisdom. I mean, that being asked, Is it lawful? He did not at once say, It is not lawful, lest they should be disturbed and put in disorder, but before the decision by His argument He rendered this manifest, showing that it is itself too the commandment of His Father, and that not in opposition to Moses did He enjoin these things, but in full agreement with him. But mark Him arguing strongly not from the creation only, but also from His command. For He said not, that He made one man and one woman only, but that He also gave this command that the one man should be joined to the one woman. But if it had been His will that he should put this one away, and bring in another, when He had made one man, He would have formed many Women. But now both by the manner of the creation, and by the manner of lawgiving, He showed that one man must dwell with one woman continually, and never break off from her. And see how He saith, "He which made them at the beginning, made them male and female," that is, from one root they sprung, and into one body came they together, "for the twain shall be one flesh." After this, to make it a fearful thing to find fault with this lawgiving, and to confirm the law, He said not, "Sever not therefore, nor put asunder," but, "What God hath joined together, let not man put asunder." But if thou put forward Moses, I tell thee of Moses' Lord, and together with this, I rely upon the time also. For God at the beginning made them male and female; and this law is older (though it seem to have been now introduced by me), and with much earnestness established. For not merely did He bring the woman to the man, but also commanded to leave father and mother. And neither did He make it a law for him merely to come to the woman, but also "to cleave to her," by the form of the language intimating that they might not be severed. And not even with this was He satisfied, but sought also for another greater union, "for the twain," He saith, "shall be one flesh." Then after He had recited the ancient law, which was brought in both by deeds and by words, and shown it to be worthy of respect because of the giver, with authority after that He Himself too interprets and gives the law, saying, "So that they are no more twain, but one flesh." Like then as to sever flesh is a horrible thing, so also to divorce a wife is unlawful. And He stayed not at this, but brought in God also by saying, "What therefore God hath joined together, let not man put asunder," showing that the act was both against nature, and against law; against nature, because one flesh is dissevered; against law, because that when God hath joined and commanded it not to be divided, ye conspire to do this.

(Cont. Faust. xix. 29.) Behold now out of the books of Moses it is proved to the Jews that a wife may not be put away. For they thought that they were doing according to the purport of Moses' law when they did put them away. This also we learn hence by the testimony of Christ Himself, that it was God who made it thus, and joined them male and female; which when the Manichæans deny, they are condemned, resisting the Gospel of Christ.

(Civ. Dei, xiv. 22.) For they are called one, either from their union, or from the derivation of the woman, who was taken out of the side of the man.

(interlin.) Or, one flesh, that is in carnal connection.