Revelation 12:1 And there appeared a great wonder in heaven; a woman clothed with the sun, and the moon under her feet, and upon her head a crown of twelve stars: 2 And she being with child cried, travailing in birth, and pained to be delivered. 3 And there appeared another wonder in heaven; and behold a great red dragon, having seven heads and ten horns, and seven crowns upon his heads. 4 And his tail drew the third part of the stars of heaven, and did cast them to the earth: and the dragon stood before the woman which was ready to be delivered, for to devour her child as soon as it was born.
[The Desire Of Ages. pp 764] At the beginning of the great controversy, the angels did not understand this. Had Satan and his host then been left to reap the full result of their sin, they would have perished; but it would not have been apparent to heavenly beings that this was the inevitable result of sin. A doubt of God's goodness would have remained in their minds as evil seed, to produce its deadly fruit of sin and woe. But not so when the great controversy shall be ended. Then, the plan of redemption having been completed, the character of God is revealed to all created intelligences. The precepts of His law are seen to be perfect and immutable.
Then sin has made manifest its nature, Satan his character. Then the extermination of sin will vindicate God's love and establish His honor before a universe of beings who delight to do His will, and in whose heart is His law. Well, then, might the angels rejoice as they looked upon the Savior's cross; for though they did not then understand all, they knew that the destruction of sin and Satan was forever made certain, that the redemption of man was assured, and that the universe was made eternally secure. Christ Himself fully comprehended the results of the sacrifice made upon Calvary. To all these He looked forward when upon the cross He cried out, “It is finished.”
Revelation 12:12 Therefore rejoice, ye heavens, and ye that dwell in them. Woe to the inhabiters of the earth and of the sea! for the devil is come down unto you, having great wrath, because he knoweth that he hath but a short time.
May The Lord add His blessing to the study of His word. God bless!