Aliens and Exiles

"Christians. . . dwell in their own countries but only as sojourners; they bear their share in all things as citizens, and they endure all hardships as strangers. Every foreign country is a fatherland to them, and every fatherland is foreign. They marry like all other men, and they beget children; but they do not cast away their offspring. They have their meals in common but not their wives. They find themselves in the flesh, and yet they live not after the flesh. Their existence is on earth, but their citizenship is in heaven. They obey the established laws, and they surpass the laws in their own lives."

--The Epistle to Diognetus 5.5-10 (late 2nd Century)