It was revealed to Ellen White that she should present an outline of the controversy between Christ and Satan, as it developed in the first centuries of the Christian Era and the great Reformation of the sixteenth century, in such a way as to prepare the mind of the reader to understand clearly the controversy going on in the present day. Writing of this in 1888 as she had occasion (just four years after its issuance) to enlarge and revise volume 4, she explained: WV 268.4
As the Spirit of God has opened to my mind the great truths of His Word, and the scenes of the past and the future, I have been bidden to make known to others that which has thus been revealed—to trace the history of the controversy in past ages, and especially so to present it as to shed a light on the fast approaching struggle of the future. WV 268.5
In pursuance of this purpose, I have endeavored to select and group together events in the history of the church in such a manner as to trace the unfolding of the great testing truths that at different periods have been given to the world, that have excited the wrath of Satan, and the enmity of a world-loving church.... WV 268.6
In these records we may see the foreshadowing of the conflict before us. Regarding them in the light of God's Word, and by the illumination of His Spirit, we may see unveiled the devices of the wicked one.... The great events which have marked the progress of reform in past ages, are matters of history, well known and universally acknowledged by the Protestant world; they are facts which none can gainsay (The Great Controversy, 14). WV 268.7