John Newton, author of the hymn "Amazing Grace," said, "If I might read only one book beside the Bible, I would choose The Christian in Complete Armour." Charles Spurgeon wrote, "Gurnall's work is peerless and priceless; every line is full of wisdom; every sentence is suggestive." David Wilkerson, author of The Cross and the Switchblade, wrote, "The Christian in Complete Armour should be in the library of every man and woman of God." Originally written in 1655 in three volumes, this Puritan classic on spiritual warfare has been updated into modern English and abridged for easy reading. Volume 3 covers the last three pieces of the armour: the shield of faith, the helmet of salvation, and the sword of the Spirit.