Christians are indistinguishable from other men either by nationality, language, or customs. They do not inhabit separate cities of their own, or speak a strange dialect, or follow some outlandish way of life...

With regard to dress, food and manner of life in general, they follow the customs of whatever city they have to be living in...

And yet there is something extraordinary about their lives. They live in their own countries as though they were only passing through. They play their full role as citizens, but labor under all the disabilities of aliens. Any country can be their homeland, but for them their homeland, wherever it may be, is a foreign country. Like others, they marry and have children, but they do not expose them.

They pass their days on earth, but a re citizens of heaven. Obedient to the laws, they live on a level that transcends the law.

Author unknown, quoted from Letter to Diogentus