John H. Armstrong is president of ACT 3 in Carol Stream, Illinois and served as a pastor for more than twenty years. He is an adjunct professor of evangelism at Wheaton College Graduate School. His online commentaries regularly appear at www.Act3online.com. He holds degrees from Wheaton College, Wheaton Graduate School, and Luther Rice Seminary. He is the author or editor of a number of books including The Catholic Mystery, Five Great Evangelists, Understanding Four Views on the Lord's Supper, and Understanding Four Views on Baptism