This is a study of the Biblical teaching about the person and work of the Holy Spirit, the third person of Trinity. This is a subject that has been badly neglected in most Protestant churches. Each chapter begins with a quotation from a respected Bible scholar, and other quotations are included in the text. It was written for individual and group study. After the exposition of each chapter, there are suggestions for further Bible study, and questions for thought and discussion. The theological position is primarily, but not entirely, that of Reformed theology. Certainly, it is far from an exhaustive study, but it does cover the major topics regarding the Holy Spirit and his work. In every chapter, relevant passages from the Old Testament are included as well as New Testament references. The bibliography of works used and cited will lead you to many excellent sources that can be used to continue and expand your study of the Holy Spirit.