This purpose is stated in verses 5, 8, and 10. We are to love our husbands and children, pursue self-control and purity, be workers at home, kind and submissive:
that the word of God may not be reviled. (v. 5)
so that an opponent may be put to shame, having nothing evil to say about us. (v. 8)
so that in everything [we] may adorn the doctrine of God our Savior. (v. 10)
Our conduct has a direct influence on how people think about the gospel. The world doesn’t judge us by our theology; the world judges us by our behavior. People don’t necessarily want to know what we believe about the Bible. They want to see if what we believe makes a difference in our lives. Our actions either bring honor to God or misrepresent His truth.
How sobering it is to realize that our behavior has the potential to discredit the gospel.