John Bunyan was one of the most remarkable of the English Puritans. An uneducated tinker, his conversion from a life of utter dissolution to a penetrating preacher and writer gave the Church one of its most profound spiritual authors. He was arrested for preaching the Gospel without a license, and locked away in a dark, damp jail for twelve years. During that time he wrote The Pilgrim's Progress, an allegory of a Christian making his...