“Next to the Bible, John Bunyan’s Pilgrim’s Progress is the best-selling Christian book of all time. At its first appearance (part one, 1678; part two, 1684), it was an instant hit, and it has never been out of print; there have been literally hundreds of editions and dozens of translations. By common consent it is Bunyan’s masterpiece and a milestone in English literature, both sacred and secular.”
–J. I. Packer, “Pilgrim’s Progress,” in The Devoted Life: An Invitation to the Puritan Classics, ed. Kapic and Gleason (Downers Grove, Ill.: InterVarsity Press: 2004), 183.