Mark 10:6

(cont. Faust. xix. 29) Behold the Jews are convinced out of the books of Moses, that a wife is not to be put away, while they fancied that in putting her away, they were doing the will of Moses. In like manner from this place, from the witness of Christ Himself, we know this, that God made and joined male and female, for denying which the Manichees are condemned, resisting now not the books of Moses, but the Gospel of Christ.

(ubi sup.) He says not male and females, which the sense would have required had it referred to the divorce of former wives, but male and female, so that they might be bound by the tie of one wife.

(Cat. in Marc. Oxon.) Or else, it is said, For the hardness of your hearts, because it is possible for a soul purged from desires and from anger to bear the worst of women; but if those passions have a redoubled force over the mind, many evils will arise from hatred in marriage. (Chrys. ubi sup.). Thus then, He saves Moses, who had given the law, from their accusation, and turns the whole upon their head. But since what He had said was grievous to them, He at once brings back the discourse to the old law, saying, But from the beginning of the creation, God made them male and female.