1 Peter 3:5-6

5 For in this way in former times the holy women also, who hoped in God, used to adorn themselves, being submissive to their own husbands; 6 just as Sarah obeyed Abraham, calling him lord, and you have become her children if you do what is right without being frightened by any fear.

The holy women like Sarah did adorn themselves with a gentle and quiet spirit; and thus, being holy she was submissive to her husband Abraham and also to God. All wives who do the same as Sarah will become her children (spiritually). And though some may be fearful of a non-believing husband, they need not be; for they are doing what is right in the eyes of God and He will guard their souls. Evil men may kill the body but not the soul.