This book on the Holy Spirit is the outgrowth of lectures on the topic given in Dr. Walvoord's classes at Dallas Theological Seminary. Over the years, this book has aroused considerable interest and gone through 23 printings in hardcover before prompting this new paperback edition. The Holy Spirit is an extensive treatment of the entire doctrine of pneumatology, using some 1500 Scripture citations, and is designed for theological students and pastors as well as for laypeople desiring to get a complete presentation of the third person of the Trinity who indwells all Christians.