8. There was one great subject especially which Christ had to leave unexplained--his own death. He could not explain it before it had taken place. This became the leading topic of Paul's thinking--to show why it was needed and what were its blessed results. But, indeed, there was no aspect of the appearance of Christ into which his restlessly inquiring mind did not penetrate. His thirteen Epistles, when arranged in chronological order, show that his mind was constantly getting deeper and deeper into the subject. The progress of his thinking was determined partly by the natural progress of his own advance in the knowledge of Christ, for he always wrote straight out of his own experience; and partly by the various forms of error which he had at successive periods to encounter, and which became a providential means of stimulating and developing his apprehension of the truth, just as ever since in the Christian Church the rise of error has been the means of calling forth the clearest statements of doctrine. The ruling impulse, however, of his thinking, as of his life, was ever Christ, and it was his lifelong devotion to this exhaustless theme that made him the Thinker of Christianity. 9. The Missionary of the Gentiles.--Christianity obtained in Paul, thirdly, the missionary of the Gentiles. It is rare to find the highest speculative power united with great practical activity; but these were united in him. He was not only the Church's greatest thinker, but the very foremost worker she has ever possessed. We have been considering the speculative task which was awaiting him when he joined the Christian community; but there was a no less stupendous practical task awaiting him too. This was the evangelization of the Gentile world. 10. One of the great objects of the appearance of Christ was to break down the wall of separation between Jew and Gentile and make the blessings of salvation the property of all men, without distinction of race or language. But he was not himself permitted to carry this change into practical realization. It was one of the strange limitations of his earthly life that he was sent only to the lost sheep of the house of Israel. It can easily be imagined how congenial a task it would have been to his intensely human heart to carry the gospel beyond the limits of Palestine and make it known to nation after nation; and--if it be not too bold to say so--this would certainly have been his chosen career, had he been spared. But he was cut off in the midst of his days and had to leave this task to his followers.