INTRODUCTION To many Christians, the Holy Spirit is a mystery. He is the “hidden” member of the Trinity. The Father we know; the Son we know; but what about the Holy Spirit? Few believers understand who He is, why He came, or what He does in the world today. Fewer still understand the vital role He plays in the Christian life. I don’t think I’m going overboard in saying that a proper knowledge of the Holy Spirit’s ministry is absolutely essential to finding peace, joy, and victory as a Christian.