No one can doubt that prophecy is based upon revelation. No man can truthfully predict the future save God reveals it to him. "Prophecy came not in old time by the will of man," writes Peter, "but holy men of God spake as they were moved upon by the Holy Ghost." [25] Again, in further proof that the Holy Ghost is the means of revelation and the source of prophecy--"When the Spirit of Truth is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear that he shall speak; and he will show you things to come." [26] This Jesus said of the Holy Ghost. If anything were lacking to prove that the Holy Ghost is a medium of revelation, the very spirit of prophecy, it would be found in the following: "When the Comforter is come, whom I will send unto you from the Father, even the Spirit of Truth, which proceedeth from the Father, he shall testify of me." [27] To this Paul agrees: "No man speaking by the Spirit of God, calleth Jesus accursed, and no man can say that Jesus is the Christ but by the Holy Ghost." [28] It is the Holy Ghost, then, that testifies that Jesus is the Christ. Now mark what follows: An angel appeared to John, the Apostle, on Patmos, "and," says John, "I fell at his feet to worship him, and he said unto me, See thou do it not: I am thy fellow servant, and of thy brethren that have the testimony of Jesus: Worship God: for the testimony of Jesus _is the spirit of prophecy._" [29] This is the sum of my argument: The Holy Ghost testifies that Jesus is the Christ, and that "testimony of Jesus" is the spirit of prophecy; and since prophecy must of necessity be based on revelation, the "testimony of Jesus"--the Holy Ghost must also be the spirit of revelation. When Peter on the day of Pentecost preached the famous sermon by which three thousand souls were converted, he made an unqualified promise of the Holy Ghost unto all who would obey the gospel. Replying to the cry of the multitude, "Men and brethren, what shall we do?" he said: "Repent and be baptized every one of you, in the name of Jesus Christ, for the remission of sins, and ye shall receive the gift of the Holy Ghost. For the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call." [30] This simply means that the Holy Ghost is promised to all who will obey the gospel. It was promised to those that were listening to the apostle, to their children, to all that were afar off, not only as to distance, but as to time; to those a hundred years off, five hundred, or five thousand years off; "even to as many as the Lord our God shall call"--that is, called to obedience to the gospel. It is a promise that reaches our own generation as well as the first generation of the Christian era.