Revelation 12:7 And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels, 8 And prevailed not; neither was their place found any more in heaven.
[The Great controversy pp 494] Lucifer might have remained in favor with God, beloved and honored by all the angelic host, exercising his noble powers to bless others and to glorify his Maker. But, says the prophet, “Thine heart was lifted up because of thy beauty, thou hast corrupted thy wisdom by reason of thy brightness.” [Ezekiel 28:12-15, 17.] Little by little, Lucifer came to indulge a desire for self-exaltation. “Thou hast set thine heart as the heart of God.”
“Thou hast said: ... I will exalt my throne above the stars of God; I will sit also upon the mount of the congregation.” “I will ascend above the heights of the clouds; I will be like the Most High.” [Ezekiel 28:6; Isaiah 14:13, 14.] Instead of seeking to make God supreme in the affections and allegiance of his creatures, it was Lucifer's endeavor to win their service and homage to himself.
And, coveting the honor which the infinite Father had bestowed upon his Son, this prince of angels aspired to power which it was the prerogative of Christ alone to wield. All Heaven had rejoiced to reflect the Creator's glory and to show forth his praise. And while God was thus honored, all had been peace and gladness. But a note of discord now marred the celestial harmonies. The service and exaltation of self, contrary to the Creator's plan, awakened forebodings of evil in minds to whom God's glory was supreme.
Revelation 12:9 And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.
May God add His blessing to the study of His word. “Good night” and God bless!