Dr. Barclay does more than clarify the meaning of the imagery. His commentary covers many interesting subjects, such as the seven gifts of the Holy Spirit, the probable facts about John's exile on the island, and the meaning of Christ's knocking at the door.
WIlliam Barclay was a Scottish author, radio and television presenter, Church of Scotland minister, and Professor of Divinity and Biblical Criticism at the University of Glasgow. He wrote a popular set of Bible commentaries on the New Testament that sold 1.5 million copies.