A History of Christianity: The First Three Thousand Years

by Diarmaid MacCulloch

The Christianity which emerged in reaction to these two possibilities adopted the same strategy as Marcion: it sought to define, to create a uniformity of belief and practice, just as contemporary Judaism was doing at the same time in reaction to the disaster of Jerusalem’s fall. That demanded a concept of the Church as one wherever it was: a universal version of Christianity which had taken up Paul’s mission to the Gentiles and combined it with much of the rhetoric and terminology of ancient Israel to express its wider unity. From an ordinary Greek adjective for ‘general’, ‘whole’ or ‘universal’, katholikos/ē, there developed a term of great resonance for Christianity, despite the fact that the word is not to be found in the Bible. Bishop Ignatius of Antioch provides the first known use in his letter written to the Christians of Smyrna, in the early second century, but he evidently expected his readers to be familiar with it; he certainly did not bother to explain exactly what he meant by ‘the whole’ (katholikē) Church.46