For Apostolic believers, the gift of the Holy Spirit defines who we are. From the first chapter of Genesis to the last chapter of Revelation, the Holy Spirit is evident in shaping our lives. A typical Bible commentary offers verse-by-verse analysis, usually of a single book of the Bible. This book resembles Bible commentaries in its thorough and comprehensive scope and its canonical survey of the Holy Spirit in Scripture. But unlike commentaries, this book gives us knowledge to undergird our Pentecostal experience. And that knowledge gives us pause to celebrate the work of the Spirit in our lives.