(1) If Luke had written the Fourth Gospel, the case would be different; but Luke wrote (assuming his authorship of the Third Gospel and the Acts)[8] the Gospel which contains the Sermon on the Mount and the parables of the Good Samaritan and the Prodigal Son. When one remembers that Luke was the intimate companion of Paul and his co-labourer in missionary work before he wrote his Gospel, that he derived his material largely from "eye-witnesses of the word," and that afterwards he recorded the teaching of both Peter and Paul in the Acts, it is clear that Luke himself saw no essential difference between the Christianity of the primitive apostles and that of Paul, and it becomes improbable that such a difference existed.

(2) Paul took with him on his missionary journeys Barnabas and Silas, accredited leaders and representatives of the primitive Jerusalem church (Acts xiii. 2f.; xv. 40). Paul's work for years was carried on under the surveillance of these men, and Barnabas stood sponsor for Paul before the Jerusalem authorities (Acts xv. 12). The close connection of these two men with both parties excludes the supposition of any radical difference in their doctrines.

(3) Paul's Christology was accepted by his Jewish-Christian opponents at Jerusalem, and never questioned by them. Paul we know to have been bitterly assailed by a Pharisaic party in the Jerusalem church. They dogged his steps wherever he went; they impugned his orthodoxy from the Mosaic standpoint; they called in question his apostleship and his sincerity. But it is significant that they never assailed as an innovation the Christological views in which he is supposed to differ from them. "Certain from James" (Gal. ii. 12), in the bitter polemic over circumcision, never accused Paul, as they would have done if his views were different in this respect, of a declension from Jewish monotheism. Paul doubtless used the name current in Jerusalem when he spoke, in a context in which he puts Christ above men and above angels and on an equality with God as a source of grace, of "James, the Lord's brother" (Gal. i. 3, 12, 19). He used the same titles as did those at Jerusalem, and a difference in Christological dogma can only be made out by saying that the names are used in different senses.[9] This is to admit that the difference discovered by modern critical acumen was so small as not to be recognized by either party at the time. In Paul's controversial encounter with Peter, in a context full of the characteristic Pauline ideas of Justification, of the Cross, of the indwelling Christ, and of Jesus as the Son of God, Paul appealed to the essential unity of their Christian faith and experience (Gal. ii. 11-21).

(4) Paul asserts the identity of his gospel with that of the primitive apostles as well known to his readers. He preached the faith of which he once made havoc (Gal. i. 23). His gospel of a crucified and risen Christ, he declares, was "received," not invented (I Cor. xv. 3), was in accordance with Jewish Scriptures, and the inference is unavoidable that it was held and taught in common by Peter and James, the Jerusalem leaders. Both Peter and Paul taught Jesus and the Resurrection (Acts ii. 31; xiii. 34; xvii. 31); and as Harnack says, there is no reason to doubt the representations of the first chapter of the Acts as to early apostolic belief.[10]

The Resurrection is emphasized alike in the speeches of Peter in Acts and in the First Epistle (I Peter i. 3; ii. 24; iii. 21). In Romans the Resurrection is mentioned seven times (i. 4; iv. 25; vi. 4; vii. 4; viii. 34; x. 9; xiv. 9), and enters into the warp and woof of Paul's teaching. The thought of Paul is doubtless more systematic and constructive, but it is unnatural to believe either that Paul had a different view of the nature of the Resurrection, or that he drew doctrinal inferences from it which the other apostles would not accept.[11] It is hard to see, moreover, how the theory that Paul's teaching was essentially different from that of the Jerusalem church, and the theory that Paul profoundly influenced all of the New Testament writers can consistently be held at the same time.

III. The Christianity of Jesus and of Paul

A more serious question meets us when we come to the relation of Paul's teaching to that of Jesus Himself. Behind the writers of the New Testament and behind the teaching of the apostles, is there not in the authentic words of Jesus as determined by criticism a simpler gospel of the love of God and the duty of man, from which Christology and the doctrines of the Cross are excluded? May we not "lighten the distressed ship of the gospel" by casting overboard its cargo of doctrine? Harnack thinks that we may; and in his famous lectures on the "Essence of Christianity" has set forth the seeming anomaly of the gospel of Christ with Christology omitted, a gospel which includes only the Father and not the Son.

The essence of Christianity according to Paul would be contained in the statements, "While we were yet sinners Christ died for us" (Rom. v. 8); "God was in Christ reconciling the world" (2 Cor. v. 19); "He loved me and gave himself for me" (Gal. ii. 20). Paul's gospel was the gospel of Christ and Him crucified. The essence of Christianity according to Harnack consists in the truths of the fatherly love of God and the value of the individual soul. It is indeed a gospel preached by Christ, but in the content of its message is the Father only—not the Son.[12] The contrast thus asserted suggests the need of a closer examination of the relation of Jesus and Paul.

Nothing is more striking in the comparison between Jesus and Paul than the difference in their personality and yet the similarity in their ethical teaching. Jesus was a Galilean, born in humble circumstances, belonging to the peasant or working class, a stranger to the training of the schools, a "layman," and an Oriental in His mode of thought and expression. Paul was a native of Tarsus, a Greek city which was noted as the seat of a philosophical school; his father was a man of consequence, a Roman citizen, who gave his son the best education that the Jewish schools could afford. He was a typical member of the proudest caste of a proud nation, proud of his race, of his learning, of his strictness in religion and his zeal for the Law (Phil. iii. 6), trained in the refinements of Rabbinical dialectic, but an Occidental in his method of thought. Yet in ethics Paul stands very near to Jesus. Both emphasized the same virtues, and these the very virtues most foreign to Paul's early Græco-Roman environment and his later Pharisaic prejudice. Where Jesus said, "Blessed are the poor in spirit," Paul, blameless in the law, said, "Boasting is excluded. By grace are ye saved" (Rom. iii. 27; Eph. ii. 5). Where Jesus said, "He that exalteth himself shall be humbled" (Luke xviii. 14), Paul, the Pharisee, said, "In lowliness of mind let each esteem other better than themselves" (Phil. ii. 3). Where Jesus said, "Love your enemies," Paul, the persecutor now the persecuted, repeated the command so foreign to the moral ideals of his time (Rom. xii. 20). Both taught that in the command to love one's neighbour was a summary of the moral law (Rom. xiii. 10; Matt. xxii. 38, 39).

Paul's great ethical passages, such as Romans xii. and I Corinthians xiii., are but republications in Pauline language of the Sermon on the Mount. In moral teaching Jesus and Paul are at one, although there can be no doubt which was the originator of the Christian philosophy of life. Jesus whose code was but the transcript of His character is the original; and Paul, conformed in thought and spirit to the image of Jesus, was the echo.