In 1858, Ellen G. White felt moved to give her testimony of faith at a funeral she and
her husband attended. While giving her testimony, a vision of Christ, Satan, and the
apocalypse came over her, and she wrote down everything she could remember when
she returned home. She published the documentation of her vision later that same year.
The Great Controversy describes what she saw as the ongoing battle between Jesus and
Satan throughout the ages, then prophesies about how that battle will end. White's book
is considered a foundational text of the Seventh-Day Adventist Church, although it has
gathered considerable popularity among those of different affiliations.