The following second-century account provides us with a double-edged challenge to better understand how earlier believers' lifestyles were shaped by eternity:
“For Christians are not distinguished from the rest of mankind by country, or by speech, or by dress. For they do not dwell in cities of their own, or use a different language, or practice a peculiar life. This knowledge of theirs has not been proclaimed by the thought and effort of restless men; they are not champions of a human doctrine, as some men are. But while they dwell in Greek or barbarian cities according as each man’s lot has been cast, and follow the customs of the land in clothing and food, and other matters of daily life, yet the condition of citizenship which they exhibit is wonderful, and admittedly strange. They live in countries of their own, but simply as sojourners. They share the life of citizens; they endure the lot of foreigners. Every foreign land is to them a fatherland, and every fatherland a foreign land. They marry like the rest of the world. They breed children, but they do not discard their children as some do. They offer a common table, but not a common bed. They exist in the flesh, but they do not live after the flesh. They spend their existence upon earth, but their citizenship is in heaven. They obey the established laws, and in their own lives they surpass the laws. They love all men, and are persecuted by all. They are unknown, and they are condemned.
They are put to death, and they gain new life. They are poor, and make many rich. They lack everything, and in everything they abound. They are dishonored, and their dishonor becomes their glory. They are reviled, and are justified. They are abused, and they bless. They are insulted, and repay insult with honor. They do good, and are punished as evildoers; and in their punishment they rejoice as gaining new life therein. The Jews war against them as aliens, and the Greeks persecute them; and they that hate them can state no grounds for their enmity. “In a word, what the soul is in the body Christians are in the world. The soul is spread through all the members of the body, and Christians through all the cities of the world. The soul dwells in the body, but it is not of the body. Christians dwell in the world, but they are not of the world.”
Letter to Diognetus, 5:1-17, 6:1-4