1 Peter 3:1-4

In the same way, wives, be subject to your own husbands. Then, even if some are disobedient to the word, they will be won over without a word by the way you live,  when they see your pure and reverent conduct.  Let your beauty not be external—the braiding of hair and wearing of gold jewelry or fine clothes—  but the inner person of the heart, the lasting beauty of a gentle and tranquil spirit, which is precious in God’s sight.

This is about conforming to the image of Jesus Christ in a God-given role: specifically the role of a wife. This verse reveals that a wife’s beauty comes from within, and the adornment of this beauty is pleasing in God’s sight. What is precious in the sight of God? The answer is “the incorruptible beauty of a gentle and quiet spirit”. A wife surrendered to Christ bears a meek and quiet spirit by the power of His grace. Her husband is a recipient of the transforming grace and testimony offered to him though his wife, which is able to win him over. Submission is a sub-mission, and that mission is the transformation of her husband’s heart for Jesus made possible by the sovereign grace of God at work in her life.