Though he is perhaps best known for his work Pilgrim’s Progress, one of the essential pieces of Christian allegory, John Bunyan’s Grace Abounding to the Chief of Sinners is equally stirring, particularly when the author’s backstory is made clear. Composed while he was serving a decade-long sentence in prison, Grace Abounding has inspired readers to turn over their problems to Christ as a way of letting go of their greatest doubts, much in the same way that John Bunyan did as he faced 12 years behind bars — for preaching without a license, of all offenses.