See how the truth convicted those Jews on the day of Pentecost. Peter, filled with the Holy Ghost, preached that "God hath made this same Jesus, whom ye have crucified, both Lord and Christ." "Now when they heard this, they were _pricked in their heart_, and said unto Peter and to the rest of the apostles, Men and brethren, what shall we do?" Then, thirdly, the Holy Ghost convicts. I once heard the late Dr. A. J. Gordon expound that passage--"And when He (the Comforter) is come, He will reprove the world of sin, of righteousness, and of judgment; of sin because they believe not on Me,"--as follows:-- "Some commentators say there was no real conviction of sin in the world until the Holy Ghost came. I think that foreign missionaries will say that that is not true, that a heathen who never heard of Christ may have a tremendous conviction of sin. For notice that God gave conscience first, and gave the Comforter afterward. Conscience bears witness to the law, the Comforter bears witness to Christ. Conscience brings legal conviction, the Comforter brings evangelical conviction. Conscience brings conviction unto condemnation, and the Comforter brings conviction unto justification. 'He shall convince the world of sin, because they believe not on Me.' That is the sin about which He convinces. It does not say that He convinces men of sin, because they have stolen or lied or committed adultery; but the Holy Ghost is to convince men of sin because they have not believed on Jesus Christ. The coming of Jesus Christ into the world made a sin possible that was not possible before. Light reveals darkness; it takes whiteness to bring conviction concerning blackness. There are negroes in Central Africa who never dreamed that they were black until they saw the face of a white man; and there are a great many people in this world that never knew they were sinful until they saw the face of Jesus Christ in all its purity. Jesus Christ now stands between us and the law. He has fulfilled the law for us. He has settled all claims of the law, and now whatever claim it had upon us has been transferred to Him, so that it is no longer the _sin_ question, but the _Son_ question, that confronts us. And, therefore, you notice that the first thing Peter does when he begins to preach after the Holy Ghost has been sent down is about Christ: 'Him being delivered by the determinate counsel of God, ye have taken and by wicked hands have crucified and slain.' It doesn't say a word about any other kind of sin. That is the sin that runs all through Peter's teaching, and as he preached, the Holy Ghost came down and convicted them, and they cried out, 'What shall we do to be saved?'