The Doctrine of the Spirit: Three Sermons is a book written by Alfred Barry and published in 1867. The book contains three sermons that explore the Christian doctrine of the Holy Spirit. In the first sermon, Barry examines the nature of the Holy Spirit and its role in the Trinity. He argues that the Holy Spirit is a distinct person within the Godhead and that it is the source of all spiritual power and life. In the second sermon, Barry focuses on...