John Chrysostom
But if he who is joined to a harlot becomes one body with her, does it not follow that a woman joined to an idolater is one body with him? Yes, she is one body with him, but she does not become impure.
The purity of the wife overcomes the impurity of the husband, just as the purity of the believing husband overcomes the impurity of the unbelieving wife.
Why, then, is impurity overcome here and cohabitation permitted, while in the case of a wife's adultery the husband is not forbidden to put her away?
Because here there is hope that the lost part will be saved through marriage. But there the marriage has already been broken. There both persons are corrupted, while here only one is at fault.
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I will speak by way of example. A woman who has once fallen into adultery is impure. If he who is joined to a harlot is one body with her and himself becomes impure, then both are deprived of purity.
But here it is not so. How, then, is it? The idolater is impure, but the wife is not impure.
If she shared with him in that wherein he is impure, that is, in impiety, then she herself would become impure. But now the idolater is impure in one respect, while the wife shares with him in another.
In that respect he is not impure, because in marriage and union they share mutually.
Moreover, there is hope here that the wife of the unbeliever will convert him, since she belongs to him. But there this is very difficult.
How can a wife, after first dishonoring her husband, serving another, and violating the rights of marriage, again make the injured husband her own, when he has become almost a stranger to her?
After adultery the husband is no longer a husband. But here, if the wife is an idolatress, the husband's rights are not violated.
Moreover, she does not live with the unbeliever simply, but by his desire. Therefore the Apostle said, "and he is willing to live with her" (1 Cor 7:13).
Tell me, what harm is there if they remain united, when piety is preserved whole, good hope remains for the unbeliever's conversion, and occasions for useless quarrels are avoided?
Here the Apostle is not speaking about those who have not yet been joined in marriage, but about those already joined. He did not say, "if anyone wishes to marry an unbeliever," but, "if anyone has an unbeliever."
That is, if someone after marrying receives the pious teaching, while the other person remains in unbelief and yet wishes to live together, the marriage is not dissolved.
"For the unbelieving husband," he says, "is sanctified by the wife." Such is the abundance of your purity.
How so? Is the pagan holy? No. He did not say, "he is holy," but, "he is sanctified by the wife."
He said this not to declare the pagan holy, but to calm the wife as much as possible, and to stir in the husband a desire for the truth.
Impurity lies not in the bodies of those joined together, but in the will and in the thoughts.
Then a proof is offered. If you, being impure, give birth to a child, who comes not from you alone, is the child impure, or only half pure?
In the present case he is not impure. "Otherwise," the Apostle continues, "your children would be impure, but now they are holy," that is, not impure.
He calls them holy in order, by such a strong name, again to drive away the spouses' fear.
"If a believing wife," it is said, "has an unbelieving husband, and he consents to live with her, she must not leave him" (1 Cor 7:13).
But concerning a harlot this is not said. What is said? "Whoever divorces his wife, except for the cause of fornication, makes her commit adultery" (Mt 5:32).
If through cohabitation husband and wife become one body, then he who lives with a harlot necessarily becomes one body with her.
How then will an honorable wife, being a member of Christ, receive such a husband? Or how will she unite to herself a member of a harlot?
Observe the distinction. A woman who lives with an unbeliever does not thereby become impure. "For the unbelieving husband," it is said, "is sanctified by the believing wife" (1 Cor 7:14).
But concerning the harlot this is not said. What is said? "Shall I take the members of Christ and make them members of a harlot?" (1 Cor 6:15).
There sanctification remains and is not taken away, despite cohabitation with an unbeliever. But here it withdraws.