This book is a study of Pentecost and its meaning for Christians today. As Jones writes, “The human spirit fails unless the Holy Spirit fills.” Jones warns the church against becoming “a mush of amiability.” In this book, Jones shares his experience of conversion and receiving the Holy Spirit, God’s greatest gift. He addresses the church and writes that Pentecost is not a luxury, but a stark necessity for church renewal and mission. Before Pentecost, the church was behind closed doors. After that moment, it went forth with amazing courage and boundless energy into all the world.