1 Corinthians 7:14-16

Is sanctified. The meaning is not that the faith of the husband, or the wife is of itself sufficient to put the unbelieving party, or their children, in the state of grace and salvation: but that it is very often an occasion of their sanctification, by bringing them to the true faith. (Challoner) --- Sanctification which has different significations, cannot here signify that an infidel is truly and properly sanctified, or justified, by being married to a faithful believer; therefore we can only understand an improper sanctification, so that such an infidel, though not yet converted, need not be looked upon as unclean, but in the dispositions of being converted, especially living peaceably together, and consenting that their children be baptized, by which they are truly sanctified. --- How knowest thou, O wife? &c. These words seem to give the reason, why they may part, when they cannot live peaceably, and when there is little prospect that the party that is an infidel will be converted. (Witham)