The Unbelieving Spouse

QUESTION: What is the meaning of "sanctified" and "holy" in 1 Cor. 7:14: "For the unbeliving husband is sanctified in the wife, and the unbelieving wife is sanctified in the brother: else were your children unclean; but now they are holy"?

ANSWER: When either the wife or the husband becomes a Christian and the other party continues in the marriage relation, consenting to the religious change, he or she is measurably withdrawn from the contamination of heathenism and brought under the saving influence of Gospel truth and the Holy Spirit. This is the peculiar sense of "sanctified" and "holy" here used. The unconverted party is presumably on the road to salvation, and the children escape a pagan education and learn the way of salvation.

— Steele's Answers pp. 74, 75.