This sense of mission set Christians apart from other religious groups, including Jews, in the early Roman empire. The notion that it is desirable for existing enthusiasts to encourage outsiders to worship the god to whom they are devoted was not obvious in the ancient world. Adherents of particular cults did not generally judge the power of their divinity by the number of congregants prepared to bring offerings or attend festivals. On the contrary, it was common for pagans to take pride in the local nature of their religious lives, establishing a special relationship between themselves and the god of a family or place, without wishing, let alone expecting, others to join in worshiping the same god. Christians in the first generation were different, espousing a proselytizing mission which was a shocking novelty in the ancient world. Only familiarity makes us fail to appreciate the extraordinary ambition of Paul, who seems to have invented the notion of a systematic conversion of the whole world, area by geographical area.

—Martin Goodman, Rome and Jerusalem: The Clash of Ancient Civilizations

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