I was moved by the Spirit of the Lord to write that book [The Great Controversy].... I knew that time was short, and that the scenes which are soon to crowd upon us would at the last come very suddenly and swiftly, as represented in the words of Scripture, “The day of the Lord so cometh as a thief in the night” (1 Thessalonians 5:2). 3SM 413.1
The Lord has set before me matters which are of urgent importance for the present time, and which reach into the future.... I was assured that there was no time to lose. The appeals and warnings must be given. Our churches must be aroused, must be instructed, that they may give the warning to all whom they can possibly reach, declaring that the sword is coming, that the Lord's anger upon a profligate world will not long be deferred. I was shown that many would listen to the warning. Their minds would be prepared to discern the very things that it pointed out to them. 3SM 413.2
I was shown ... that the warning must go where the living messenger could not go, and that it would call the attention of many to the important events to occur in the closing scenes of this world's history. 3SM 413.3
Coming Events Shown to Ellen White—As the condition of the church and the world was open before me, and I beheld the fearful scenes that lie just before us, I was alarmed at the outlook; and night after night, while all in the house were sleeping, I wrote out the things given me of God. I was shown the heresies which are to arise, the delusions that will prevail, the miracle-working power of Satan—the false Christs that will appear—that will deceive the greater part, even of the religious world, and that would, if it were possible, draw away even the elect.... 3SM 413.4
The warning and instruction of this book are needed by all who profess to believe the present truth, and the book is adapted to go also to the world, calling their attention to the solemn scenes just before us.—Letter 1, 1890. 3SM 414.1