 Smith's teachings were published during his lifetime in several books, including the Book of Mormon, the Doctrine and Covenants (which included the Lectures on Faith), the Book of Abraham, and various essays he wrote in church newspapers.Many of his teachings were also published posthumously, including the transcription of sermons such as his King Follett Discourse, his writings in the official church history, and reminiscences of his teachings written by those who knew him.Many of these doctrines (or aspects of them) have been considered heretical by mainstream Christians (see Mormonism and Christianity), and are the cause of much controversy regarding Smith.