For the unbelieving husband is sanctified by the wife, and the unbelieving wife is sanctified by the husband: else were your children unclean; but now are they holy.
All Commentaries on 1 Corinthians 7:14 Go To 1 Corinthians 7
Tertullian of Carthage
AD 220
The children of believers were in some sense destined for holiness and salvation, and in the pledge of this hope Paul supported those marriages which he wished to continue.