Augustine of Hippo : We are here given to understand that neither spouse may divorce the other if both are believers. — QUESTIONS 83 Irenaeus : The Lord also showed that certain precepts were enacted for them by Moses, on account of their hardness [of heart], and because of their unwillingness to be obedient, when, on their saying to Him, "Why then did Moses command to give a writing of divorcement, and to send away a wife?" He said to them, "Because of the hardness of your hearts he permitted these things to you; but from the beginning it was not so;" thus exculpating Moses as a faithful servant, but acknowledging one God, who from the beginning made male and female, and reproving them as hard-hearted and disobedient. And therefore it was that they received from Moses this law of divorcement, adapted to their hard nature. But why say I these things concerning the Old Testament? For in the New also are the apostles found doing this very thing, on the ground which has been mentioned, Paul plainly declaring, "But these things I say, not the Lord." And again: "But this I speak by permission, not by commandment." And again: "Now, as concerning virgins, I have no commandment from the Lord; yet I give my judgment, as one that hath obtained mercy of the Lord to be faithful." But further, in another place he says: "That Satan tempt you not for your incontinence." If, therefore, even in the New Testament, the apostles are found granting certain precepts in consideration of human infirmity, because of the incontinence of some, lest such persons, having grown obdurate, and despairing altogether of their salvation, should become apostates from God,-it ought not to be wondered at, if also in the Old Testament the same God permitted similar indulgences for the benefit of His people, drawing them on by means of the ordinances already mentioned, so that they might obtain the gift of salvation through them, while they obeyed the Decalogue, and being restrained by Him, should not revert to idolatry, nor apostatize from God, but learn to love Him with the whole heart. — Against Heresies Book IV John Chrysostom : For as when discoursing about separating from fornicators, he made the matter easy by the correction which he applied to his words, saying, "Howbeit, not altogether with the fornicators of this world;" so also in this case he provideth for the abundant easiness of the duty, saying, "If any wife have a husband, or husband a wife, that believeth not, let him not leave her." What sayest thou? "If he be an unbeliever, let him remain with the wife, but not if he be a fornicator? And yet fornication is a less sin than unbelief." I grant, fornication is a less sin: but God spares thine infirmities extremely. And this is What He doth about the sacrifice, saying, "Leave the sacrifice, and be reconciled to thy brother." This also in the case of the man who owed ten thousand talents. For him too He did not punish for owing him ten thousand talents, but for demanding back a hundred pence from his fellow-servant He took vengeance on him. — Homily on 1 Corinthians 19 Tertullian : Therefore, when in these days a certain woman removed her marriage from the pale of the Church, and united herself to a Gentile, and when I remembered that this had in days gone by been done by others: wondering at either their own waywardness or else the double-dealing of their advisers, in that there is no scripture which holds forth a licence of this deed,-"I wonder," said I, "whether they flatter themselves on the ground of that passage of the first (Epistle) to the Corinthians, where it is written: If any of the brethren has an unbelieving wife, and she consents to the matrimony, let him not dismiss her; similarly, let not a believing woman, married to an unbeliever, if she finds her husband agreeable (to their continued union), dismiss him: for the unbelieving husband is sanctified by the believing wife, and the unbelieving wife by the believing husband; else were your children unclean." It may be that, by understanding generally this monition regarding married believers, they think that licence is granted (thereby) to marry even unbelievers. — To His Wife Book II