 Beginning in 1828, Smith began dictating the text of what later became the Book of Mormon, and also began dictating written revelations he said were inspired by God.Smith's teachings evolved over his lifetime until his death in 1844.They may generally be divided into roughly four periods, (1) an early period (1820–30) associated with the production of the Book of Mormon and founding of the Church of Christ, (2) a period (1830–33) associated with his effort to clarify and re-translate the teachings of the Bible, (3) a period in Kirtland, Ohio, and Missouri (1833–39) that produced the Word of Wisdom, the Book of Abraham, and the early development of the plural marriage doctrine, and (4) a late period (1839–44) in Nauvoo, Illinois, in which Smith further defined his views of the nature of God and the millennial theocracy.