We often talk about our Savior Jesus Christ and God the Father, but how much do we really know about the Holy Ghost, the third member of the Godhead? On the other hand, can we imagine doing anything in the Church without the guidance or influence of the Holy Ghost? The Holy Spirit is intimately involved in every aspect and facet of the gospel of Jesus Christ. He is, for example, a revelator, teacher, testifier, comforter, agent of the new birth, sanctifier, and sealer, to mention only a few of His roles. Unlike more inspirational explorations of the Holy Ghost, Robert L. Millet’s The Holy Spirit focuses on the person of the Holy Ghost and examines His varied assignments in a way that is both spiritually strengthening and intellectually enlarging. Nothing has been written for decades about the Holy Spirit with so much breadth and depth.