There can be no spiritual harmony in a marriage between a Christian and a non-Christian. Paul goes on to remind believers that they are the dwelling place of the Holy Spirit, who inhabits their hearts at salvation (2 Corinthians 6:15-17). Because of that, they are to be separate from the world—in the world, but not of the world—and nowhere is that more important than in life’s most intimate relationship—marriage.
Patuloy na ipina-paalala ni Pablo sa mga mananampalataya na ang kanilang katawan ay ay templo ng Banal na Espiritu na nananahan sa kanilang puso noong sila ay naligtas (2 Corinto 6: 15-17). Dahil dito, kailangan silang humiwalay mula sa sanlibutan - sila ay nasa sanlibutan ngunit hindi sila dapat na maging makasanlibutan - at walang relasyon na mas malapait sa isa't isa kaysa sa relasyon ng mag-asawa.