What are y'all's thoughts on this verse, 1 Corinthians 7:14:
"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 they are holy."
I think that we can better gain an understanding of what it means by first understanding what it doesn't mean. Let's look at this verse in its overall context.
1 Corinthians 7
12But to the rest speak I, not the Lord: If any brother hath a wife that believeth not, and she be pleased to dwell with him, let him not put her away.
13And the woman which hath an husband that believeth not, and if he be pleased to dwell with her, let her not leave him.
14For 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.
15But if the unbelieving depart, let him depart. A brother or a sister is not under bondage in such
cases: but God hath called us to peace.
16For what knowest thou, O wife, whether thou shalt save
thy husband? or how knowest thou, O man, whether thou shalt save
thy wife?
We can safely conclude, I believe, that the type of sanctification and holiness described in verse 14 has nothing to do with salvation. I say that because one of the spouses involved "believeth not", or is "unbelieving", and this is why Paul asks the question "For what knowest thou, O wife, whether thou shalt save thy husband? or how knowest thou, O man, whether thou shalt save thy wife?"
Seeing how this sanctification and holiness doesn't directly relate to salvation from sin, what does it relate to?
It seems, as others have already suggested, that there's simply a benefit of being in close union with a believer. My mind immediately turns to Laban being blessed when Jacob was working for him and to Potiphar's house being blessed when Joseph was working for him.