But God had raised up a man to fight the battle of the Church. Absolutely regardless of personal considerations, devoted solely to the truth, the Apostle Paul withstood Peter before the whole Church. It is exceedingly important to observe that Paul did not differ from Peter in principle; he differed from him only in practice. He said to Peter in effect, "You and I are quite agreed about the principle of justification by faith alone; why, therefore, do you belie your principles by your conduct?" In the very act of condemning the practice of Peter, therefore, Paul commends his principles; about the principles of the gospel the two chief apostles were fully agreed. Undoubtedly Peter was convinced by what Paul said; there was no permanent disagreement, even about matters of practice, between Peter and Paul. Thus did the Spirit of God guide and protect the Church. Acts 15:36 to 18:22 Soon afterward Paul went forth from Antioch on his "second missionary journey." Acts 15:36 to 18:22. Journeying with Silas by the land route to Derbe and to Lystra, where Timothy became his associate, he then apparently went to Iconium and Pisidian Antioch and then northward into Galatia proper, that is "Galatia" in the older and narrower sense of the term. Finally he went down to Troas, a seaport on the Ægean Sea. At Troas he must have been joined by Luke, the author of The Acts, since the narrative in Acts here begins to be carried on by the use of the first person, "we," instead of "they," thus showing that the author was present. Setting sail from Troas, the apostolic company soon came to Philippi in Macedonia, where an important church was founded. At last Paul and Silas were imprisoned, and although they were released through divine interposition and by the second thought of the city authorities, they were requested by the authorities to leave the city. Arriving at Thessalonica, Paul preached in the synagogue, and founded an important church, chiefly composed of Gentiles. But after a stay shorter than had been intended, persecution instigated by the Jews drove Paul out of the city. He went then to Athens, where he preached not merely in the synagogue but also directly to the Gentile passers-by in the market place. At Corinth, the capital of the Roman province Achaia, embracing Greece proper, large numbers of converts were won, and Paul spent about two years in the city. Not long after the beginning of this Corinthian residence, he wrote the two Thessalonian Epistles. The First and Second Epistles to the Thessalonians