1 Peter 2:9-10
9-10But you are the ones chosen by God, chosen for the high calling of priestly work, chosen to be a holy people, God's instruments to do his work and speak out for him, to tell others of the night-and-day difference he made for you—from nothing to something, from rejected to accepted.
11-12Friends, this world is not your home, so don't make yourselves cozy in it. Don't indulge your ego at the expense of your soul. Live an exemplary life among the natives so that your actions will refute their prejudices. Then they'll be won over to God's side and be there to join in the celebration when he arrives.