"If they would keep His commandments, God promised to give them the finest of the wheat, and bring them honey out of the rock. With long life would He satisfy them, and show them His salvation. COL 289.1"
"He should have fed them also with the finest of the wheat: and with honey out of the rock should I have satisfied thee."
EGW directly quotes and alludes to Psalm 81:16, referencing 'the finest of the wheat' and 'honey out of the rock.' This is a direct and intentional connection, not just a thematic similarity.
"Through disobedience to God, Adam and Eve had lost Eden, and because of sin the whole earth was cursed. But if God's people followed His instruction, their land would be restored to fertility and beauty. God Himself gave them directions in regard to the culture of the soil, and they were to co-operate with Him in its restoration. Thus the whole land, under God's control, would become an object lesson of spiritual truth. As in obedience to His natural laws the earth should produce its treasures, so in obedience to His moral law the hearts of the people were to reflect the attributes of His character. Even the heathen would recognize the superiority of those who served and worshiped the living God. COL 289.2"
"And unto Adam he said, Because thou hast hearkened unto the voice of thy wife, and hast eaten of the tree, of which I commanded thee, saying, Thou shalt not eat of it: cursed is the ground for thy sake; in sorrow shalt thou eat of it all the days of thy life;"
Both passages discuss the curse on the ground as a result of Adam and Eve's disobedience. The EGW passage expands on this theme by contrasting it with the potential for restoration through obedience.
"The wilderness and the solitary place shall be glad for them; and the desert shall rejoice, and blossom as the rose. It shall blossom abundantly, and rejoice even with joy and singing: the glory of Lebanon shall be given unto it, the excellency of Carmel and Sharon, they shall see the glory of the Lord, and the excellency of our God."
Both passages discuss the restoration of the land to fertility and beauty. Isaiah 35:1-2 describes a blossoming desert, while the EGW passage speaks of restoring the land to fertility and beauty through obedience to God's instructions.
"“Behold,” said Moses, “I have taught you statutes and judgments, even as the Lord my God commanded me, that ye should do so in the land whither ye go to possess it. Keep therefore and do them; for this is your wisdom and your understanding in the sight of the nations, which shall hear all these statutes, and say, Surely this great nation is a wise and understanding people. For what nation is there so great, who hath God so nigh unto them, as the Lord our God is in all things that we call upon Him for? And what nation is there so great, that hath statutes and judgments so righteous as all this law, which I set before you this day?” Deuteronomy 4:5-8 . COL 289.3"
"Behold, I have taught you statutes and judgments, even as the Lord my God commanded me, that ye should do so in the land whither ye go to possess it. Keep therefore and do them; for this is your wisdom and your understanding in the sight of the nations, which shall hear all these statutes, and say, Surely this great nation is a wise and understanding people. For what nation is there so great, who hath God so nigh unto them, as the Lord our God is in all things that we call upon him for? And what nation is there so great, that hath statutes and judgments so righteous as all this law, which I set before you this day?"
Ellen White directly references Deuteronomy 4:5-8 in this passage.