1 Peter 4:9-10

9 Be hospitable to one another without complaint. 10 As each one has received a special gift, employ it in serving one another as good stewards of the manifold grace of God.

Our hospitality to others indicates to us and them that we love them. And when we do it without complaining, that shows that we are genuine in our love. Peter also implores his readers to use their special gifts, as good stewards, to serve each other; and in so doing God’s grace will flow out of them to others.