Satan had been so highly honored, and all his acts were so clothed with mystery, that it was difficult to disclose to the angels the true nature of his work. Until fully developed, sin would not appear the evil thing it was. Heretofore it had had no place in the universe of God, and holy beings had no conception of its nature and malignity. They could not discern the terrible consequences that would result from setting aside the divine law. Satan had, at first, concealed his work under a specious profession of loyalty to God. He claimed to be seeking to promote the honor of God, the stability of His government, and the good of all the inhabitants of heaven. While instilling discontent into the minds of the angels under him, he had artfully made it appear that he was seeking to remove dissatisfaction. When he urged that changes be made in the order and laws of God's government, it was under the pretense that these were necessary in order to preserve harmony in heaven. GC 497.2 In His de…
"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."
Both passages discuss Satan's deception and his influence over others. The EGW passage elaborates on the methods of deception, while Revelation 12:9 identifies Satan as the deceiver.
"The discord which his own course had caused in heaven, Satan charged upon the law and government of God. All evil he declared to be the result of the divine administration. He claimed that it was his own object to improve upon the statutes of Jehovah. Therefore it was necessary that he should demonstrate the nature of his claims, and show the working out of his proposed changes in the divine law. His own work must condemn him. Satan had claimed from the first that he was not in rebellion. The whole universe must see the deceiver unmasked. GC 498.2"
"For thou hast said in thine heart, I will ascend into heaven, I will exalt my throne above the stars of God: I will sit also upon the mount of the congregation, in the sides of the north: I will ascend above the heights of the clouds; I will be like the most High."
Both passages describe Satan's desire to elevate himself and challenge God's authority. Isaiah 14:13-14 provides the basis for the claim that Satan sought to improve upon the statutes of Jehovah.