For after this manner in the old time the holy women also, who trusted in God, adorned themselves, being in subjection unto their own husbands:
The people who came before us are to examples to us. Peter is instructing married women here to look to them and learn frm them that were Godly women married to unbelieveing husbands...
The Apostle Paul tells us that it is best if people are not unequally yoked together in marriage, that is, for a believer to marry a non-believer because of the incredible strain placed on those differences..