Crossway just published my new book: The Whole Armor of God: How Christ's Victory Strengthens Us for Spiritual Warfare. It's a series of expositions of Ephesians 6:10-20, focusing on the Old Testament background of each of the pieces of armor. The armor is quite literally God's armor: armor that God in Christ has worn first in our place. It's a little shorter than William Gurnall on the same passage... The best current deal is at WTSBooks: https://www.wtsbooks.com/products/t...-warfare-9781433565007?variant=12269856718895 Only $10.49 (list is $14.99).