1 Corinthians 7:16

“For what knowest thou, O wife, etc.] These words may be understood, as containing a reason either why the believing party should be easy at the departure of the unbeliever, after all proper methods have been used in vain to retain him or her; taken from the uncertainty and improbability of being of any use to them, to bring them to the knowledge of Christ, and salvation by him; “for what knowest thou, O wife”; thou dost not know, thou canst not know, thou canst not be sure, whether thou shall save thy husband? be the means of bringing of him under the means of grace, and so of his conversion and salvation; there is no likelihood of it, since he is such an implacable enemy to Christ, and so…”

“What knowest thou but that by staying with thy unbelieving partner thou mayest save him or her? Enforcing the precept to stay with the unbelieving consort (Co1 7:12-14). So Ruth the Moabitess became a convert to her husband's faith: and Joseph and Moses probably gained over their wives. So conversely the unbelieving husband may be won by the believing wife (Pe1 3:1) [CALVIN]. Or else (Co1 7:15), if thy unbelieving consort wishes to depart, let him go, so that thou mayest live "in peace": for thou canst not be sure of converting him, so as to make it obligatory on thee at all costs to stay with him against his will [MENOCHIUS and ALFORD]. save--be the instrument of salvation to (Jam 5:20).”

“For what knowest thou ... - The apostle here assigns a reason why the believing party should not separate from the other needlessly, or why he should not desire to be separated. The reason is, the possibility, or the probability, that the unbelieving party might be converted by the example and entreaties of the other. Whether then ... - How do you know “but” this may be done? Is there not a possibility, nay a probability of it, and is not this a sufficient reason for continuing together? Save thy husband - Gain him over to the Christian faith; be the means of his conversion and salvation. compare Romans 11:26. We learn from this verse: (1) That there is a possibility that an unbelieving…”

“7:16 There is always the hope that the believing spouse will win the unbelieving mate to faith in Christ. However, the Greek text is ambiguous and could also be interpreted as saying that there is no guarantee that the believing mate will ever win over the unbelieving spouse.”

“O wife: Co1 9:22; Pro 11:30; Luk 15:10; Ti1 4:16; Jam 5:19, Jam 5:20; Pe1 3:1, Pe1 3:2 how: Gr. what 1 Corinthians 7:17”