"But it was not merely to accomplish the redemption of man that Christ came to the earth to suffer and to die. He came to “magnify the law” and to “make it honorable.” Not alone that the inhabitants of this world might regard the law as it should be regarded; but it was to demonstrate to all the worlds of the universe that God's law is unchangeable. Could its claims have been set aside, then the Son of God need not have yielded up His life to atone for its transgression. The death of Christ proves it immutable. And the sacrifice to which infinite love impelled the Father and the Son, that sinners might be redeemed, demonstrates to all the universe—what nothing less than this plan of atonement could have sufficed to do—that justice and mercy are the foundation of the law and government of God. GC 503.1"
"The Lord is well pleased for his righteousness’ sake; he will magnify the law, and make it honourable."
EGW directly quotes the phrase "magnify the law, and make it honourable" from Isaiah 42:21, indicating a clear and intentional allusion.
"In the final execution of the judgment it will be seen that no cause for sin exists. When the Judge of all the earth shall demand of Satan, “Why hast thou rebelled against Me, and robbed Me of the subjects of My kingdom?” the originator of evil can render no excuse. Every mouth will be stopped, and all the hosts of rebellion will be speechless. GC 503.2"
"Now we know that what things soever the law saith, it saith to them who are under the law: that every mouth may be stopped, and all the world may become guilty before God."
Both passages speak of a time when all excuses will cease and guilt will be acknowledged. The EGW passage specifically applies this to Satan, while Romans 3:19 speaks more generally about the world's guilt before God. The connection is strong and meaningful.
The cross of Calvary, while it declares the law immutable, proclaims to the universe that the wages of sin is death. In the Saviour's expiring cry, “It is finished,” the death knell of Satan was rung. The great controversy which had been so long in progress was then decided, and the final eradication of evil was made certain. The Son of God passed through the portals of the tomb, that “through death He might destroy him that had the power of death, that is, the devil.” Hebrews 2:14 . Lucifer's desire for self-exaltation had led him to say: “I will exalt my throne above the stars of God: ... I will be like the Most High.” God declares: “I will bring thee to ashes upon the earth, ... and never shalt thou be any more.” Isaiah 14:13, 14 ; Ezekiel 28:18, 19 . When “the day cometh, that shall burn as an oven;....all the proud, yea, and all that do wickedly, shall be stubble: and the day that cometh shall burn them up, saith the Lord of hosts, that it shall leave them neither root nor branch.…
"Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil;"
Ellen White directly references Hebrews 2:14 in this passage.
"For, behold, the day cometh, that shall burn as an oven; and all the proud, yea, and all that do wickedly, shall be stubble: and the day that cometh shall burn them up, saith the Lord of hosts, that it shall leave them neither root nor branch."
Ellen White directly references Malachi 4:1 in this passage.