Jesus calls us to abstain from sexual immorality, love one another near and far, and to live quiet, respectful, and productive lives. Such lives would stand out against the ways of the world in Paul's day. They would make us stand out today as well. Jesus has saved us so that we can stand out, and by such a life gain a hearing by others.
What might we tell them? That God is love. That he has saved us. That he wants us to live in love toward him and one another. And that an eternity of joy awaits those who put their faith in him. So says Jesus, the Son of God and Savior of the world. His word is gold.