The contrast between 'Jew' and 'Greek' can denote the linguistic divide between the Hebrew and Greek tongues, with 'Greek' also serving as a metonymy for the entire cultural and cultic difference between those whose world-view is circumscribed by the polytheistic pantheon of Greek religion and literature. The earliest and most important sources for Gentile Christianity are the seven authentic letters written by Paul c. 50-60 to assemblies of Christians. In recounting the geographical spread of the Pauline mission to the Gentiles, follow the terms of Roman provincial organisation and urban place names which Paul himself chose to employ in his letters. From Macedonia Paul and co-workers Timothy and Silvanus moved into mainland Greece. Early catholicism is sometimes used to refer to the developments in Gentile, particularly Pauline, Christian communities in the third generation, as they are known to everyone in the Pastoral Epistles, the letters of Ignatius and Polycarp, and the Acts of the Apostles.