"unjust, that His law was faulty, and that the good of the universe required it to be changed. In attacking the law he aimed to overthrow the authority of its Author. In the controversy it was to be shown whether the divine statutes were defective and subject to change, or perfect and immutable. PP 69.1"
"The law of the Lord is perfect, converting the soul: the testimony of the Lord is sure, making wise the simple."
EGW's statement about the perfection and immutability of God's law echoes the sentiment expressed in Psalm 19:7, which declares the law of the Lord to be perfect. The connection is thematic, focusing on the nature of God's law.
"When Satan was thrust out of heaven, he determined to make the earth his kingdom. When he tempted and overcame Adam and Eve, he thought that he had gained possession of this world; “because,” said he, “they have chosen me as their ruler.” He claimed that it was impossible that forgiveness should be granted to the sinner, and therefore the fallen race were his rightful subjects, and the world was his. But God gave His own dear Son —one equal with Himself—to bear the penalty of transgression, and thus He provided a way by which they might be restored to His favor, and brought back to their Eden home. Christ undertook to redeem man and to rescue the world from the grasp of Satan. The great controversy begun in heaven was to be decided in the very world, on the very same field, that Satan claimed as his. PP 69.2"
"For God doth know that in the day ye eat thereof, then your eyes shall be opened, and ye shall be as gods, knowing good and evil."
EGW's description of Satan's temptation and claim over the world, and God's provision of redemption through Christ, directly relates to the events initiated in Genesis 3, where the serpent (Satan) tempts Eve with the promise of becoming like God, knowing good and evil. The passage in PP provides a theological interpretation of the Genesis account.
It was the marvel of all the universe that Christ should humble Himself to save fallen man. That He who had passed from star to star, from world to world, superintending all, by His providence supplying the needs of every order of being in His vast creation—that He should consent to leave His glory and take upon Himself human nature, was a mystery which the sinless intelligences of other worlds desired to understand. When Christ came to our world in the form of humanity, all were intensely interested in following Him as He traversed, step by step, the bloodstained path from the manger to Calvary. Heaven marked the insult and mockery that He received, and knew that it was at Satan's instigation. They marked the work of counteragencies going forward; Satan constantly pressing darkness, sorrow, and suffering upon the race, and Christ counteracting it. They watched the battle between light and darkness as it waxed stronger. And as Christ in His expiring agony upon the cross cried out, “It …
"When Jesus therefore had received the vinegar, he said, It is finished: and he bowed his head, and gave up the ghost."
Ellen White directly references John 19:30 in this passage.