The Pilgrim's Progress from This World, to That Which Is to Come is a 1678 Christian allegory written by John Bunyan. It is regarded as one of the most significant works of theological fiction in English literature and a progenitor of the narrative aspect of Christian media.The Pilgrim's Progress from This World, to That Which Is to Come is a 1678 Christian allegory written by John Bunyan. It is regarded as one of the most significant works of theological fiction in English literature and a progenitor of the narrative aspect of Christian media.