II. Let us now turn our attention to Philip and his work, and its bearing on the future history and development of the Church. Here, before we go any farther, it may be well to note how St. Luke gained his knowledge of the events which happened at Samaria. We do not pretend indeed, like some critics, to point out all the sources whence the sacred writers gathered their information. Any one who has ever attempted to write history of any kind must be aware how impossible it often is for the writer himself to trace the sources of his information after the lapse of some time. How much more impossible then must it be for others to trace the original sources whence the sacred or any other ancient writers derived their knowledge, when hundreds and even thousands of years have elapsed. Our own ignorance of the past is a very unsafe ground indeed on which to base our rejection of any ancient document whatsoever. It is well, however, to note, where and when we can, the sources whence information may have been gained, and fortunately this book of the Acts supplies us with instruction on this very point. A quarter of a century later the same Saul who, doubtless, helped to make St. Philip fly on this occasion from Jerusalem, was dwelling for several days beneath his roof at Cæsarea. He was then Paul the Apostle of the Gentiles, who bore in his own person many marks and proofs of his devotion to the cause which Philip had proclaimed and supported while Paul was still a persecutor. The story of the meeting is told us in the twenty-first chapter of this book. St. Paul was on his way to Jerusalem to pay that famous visit which led to his arrest, and, in the long run, to his visit to Rome and trial before Cæsar. He was travelling up to Jerusalem by the coast road which led from Tyre, where he landed, through Cæsarea, and thence to the Holy City. St. Luke was with him, and when they came to Cæsarea they entered into the house of Philip the Evangelist, with whom they abode several days. What hallowed conversations St. Luke must there have listened to! How these two saints, Paul and Philip, would go over the days and scenes long since past and gone! How they would compare experiences and interchange ideas; and there it was that St. Luke must have had abundant opportunities for learning the history of the rise of Christianity in Samaria which here he exhibits to us.