John Bunyan (28 November 1628 – 31 August 1688) was an English Christian writer and preacher, who is well-known for his book The Pilgrim's Progress. Bunyan became a popular preacher as well as a very voluminous author, though most of his works consist of expanded sermons. In theology he was a Puritan, but not a partisan. He was no scholar, except of the English Bible, but that he knew thoroughly. He also drew much influence from Martin Luther's Commentary on the Epistle to the Galatians.