But if the unbelieving depart. — Supposing, however, the desire for separation arises from the unbelieving partner, how is the Christian partner to act? If the married life, for example, be made intolerable by the unbeliever urging the believer to join in such religious acts as conscience cannot approve, the Apostle’s previous commands for continued union do not hold good: a brother or a sister, in such cases, is not bound to insist upon the continuation of the union. “Let the unbeliever, if he so desire, depart.”
This permission is in no way contrary to our Lord’s permission of divorce on only one ground, for the Apostle has carefully reminded his readers that our Lord’s command does not apply to the case of a marriage between a believer and a heathen. In ouch cases we have no command from Him.
A brother or a sister. — That is, a Christian. In such cases, when the unbelieving partner wishes to depart, let him or her do so. The Christian partner is not, under such circumstances, bound by the marriage to continue together. Their doing so might destroy that very peace in which (not “to peace” as in the English) God has called us.