The situation which the Epistle reveals and the personal references in which it abounds are full of interest at every point. They furnish quite essential data to the historian of the Early Church. We could wish that the Apostle, telling us so much, had told us more. His allusions, clear enough, we must suppose, to the first readers, have lent themselves subsequently to very conflicting interpretations. But as they stand, they are invaluable. The fragmentary narrative of the Acts requires, especially in its earlier sections, all the illustration that can be obtained from other sources. The conversion of Paul, and the Council at Jerusalem, events of capital importance for the history of Apostolic times, are thereby set in a light certainly more complete and satisfactory than is furnished in Luke's narrative, taken by itself. And Paul's references to the Judean Church and its three "pillars," touch the crucial question of New Testament criticism, namely that concerning the relation of the Gentile Apostle to Jewish Christianity and the connection between his theology and the teaching of Jesus. Our judgement respecting the conflict between Peter and Paul at Antioch in particular will determine our whole conception of the legalist controversy, and consequently of the course of Church history during the first two centuries. Around these cursory allusions has gathered a contest only less momentous than that from which they sprung. The personal and the doctrinal element are equally prominent in this Epistle; and appear in a combination characteristic of the writer. Paul's theology is the theology of experience. "It pleased God," he says, "to reveal His Son in me" (ch. i. 16). His teaching is cast in a psychological mould. It is largely a record of the Apostle's spiritual history; it is the expression of a living, inward process--a personal appropriation of Christ, and a growing realization of the fulness of the Godhead in Him. The doctrine of Paul was as far as possible removed from being the result of abstract deduction, or any mere combination of data externally given. In his individual consciousness, illuminated by the vision of Christ and penetrated by the Spirit of God, he found his message for the world. "We believe, and therefore speak. We have received the Spirit of God, that we may know the things freely given us of God:" sentences like these show us very clearly how the Apostle's doctrine formed itself in his mind. His apprehension of Christ, above all of the cross, was the focus, the creative and governing centre, of all his thoughts concerning God and man, time and eternity. In the light of this knowledge he read the Old Testament, he interpreted the earthly life and teaching of Jesus. On the ground of this personal sense of salvation he confronted Peter at Antioch; on the same ground he appeals to the vacillating Galatians, sharers with himself in the new life of the Spirit. Here lies the nerve of his argument in this Epistle.