In 2 Corinthians 6:14–18 Paul takes up the question of being mismatched (literally “unequally yoked”) with non-Christians. This has implications for both marriage (which is outside our scope here) and working relationships. Up to this point, Paul has vividly portrayed the importance of good relationships with the people with whom we live and work.

regenerate men are made light in the Lord; they are enlightened into their state and condition by nature, to see the exceeding sinfulness of sin, to behold the glory, beauty, fulness, and suitableness of Christ, so as to be sensible of their need of him, and to be able to look unto him for life and salvation; they are enlightened more or less into the doctrines of the Gospel, and the duties of religion; and their path is a...