Ezekiel 28:11-19 (KJV) Moreover the word of the LORD came unto me, saying,
Son of man, take up a lamentation upon the king of Tyrus, and say unto him, Thus saith the Lord GOD; Thou sealest up the sum, full of wisdom, and perfect in beauty.
Thou hast been in Eden the garden of God; every precious stone was thy covering, the sardius, topaz, and the diamond, the beryl, the onyx, and the jasper, the sapphire, the emerald, and the carbuncle, and gold: the workmanship of thy tabrets and of thy pipes was prepared in thee in the day that thou wast created.
Thou art the anointed cherub that covereth; and I have set thee so: thou wast upon the holy mountain of God; thou hast walked up and down in the midst of the stones of fire.
Thou wast perfect in thy ways from the day that thou wast created, till iniquity was found in thee.
By the multitude of thy merchandise they have filled the midst of thee with violence, and thou hast sinned: therefore I will cast thee as profane out of the mountain of God: and I will destroy thee, O covering cherub, from the midst of the stones of fire.
Thine heart was lifted up because of thy beauty, thou hast corrupted thy wisdom by reason of thy brightness: I will cast thee to the ground, I will lay thee before kings, that they may behold thee.
Thou hast defiled thy sanctuaries by the multitude of thine iniquities, by the iniquity of thy traffick; therefore will I bring forth a fire from the midst of thee, it shall devour thee, and I will bring thee to ashes upon the earth in the sight of all them that behold thee.
All they that know thee among the people shall be astonished at thee: thou shalt be a terror, and never shalt thou be any more.

These quotes are by Ellen white
Christ object lesson
Page 72
Why Satan was spared

Satan was a deceiver. When he sinned in heaven, even the loyal angles did not fully discern his character. This is why God did not once destroy Satan. Had He done so, the holy angles would not have received the justice and love of God. A doubt of God goodness would have been evil seed that would yield the bitter fruit of sin and woe. Therefore the offer of evil was spared, fully to develop his character.

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The great controversy
Page 504
Sin--never again
The whole universe will have become witnesses to the nature and result of sin. And its utter exterminator, which in the beginning would have brought fear to the angles and dishonor To God, will now vindicate His love and establish His honor before the universe of being who delights to do His will, and in whose heart is His law. Never will evil again manifest. Says the word of God: "Affliction shall not rise up a second time" (Nahum 1:9).

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The story of redemption
Page 14

Lucifer was envious and jealous of Jesus Christ. Yet when all the angels bowed to Jesus to acknowledge His supremacy and high authority and rightful rule, he bowed with them; but his heart was filled with envy and hatred. Christ had been taken into the special counsel of God in regard to His plans, while Lucifer was un­acquainted with them. He did not understand, neither was he permitted to know, the purposes of God. But Christ was acknowledged sovereign of heaven, His power and authority to be the same as that of God Himself. Lucifer thought that he was himself a favorite in heaven among the angels. He had been highly exalted, but this did not call forth from him gratitude and praise to his Creator. He aspired to the height of God Himself. He gloried in his loftiness. . . . Were not his garments light and beautiful? Why should Christ thus be honored before himself?—The Story of Redemption, p. 14.