"Singleness of Purpose In the life of Christ, everything was made subordinate to His work, the great work of redemption which He came to accomplish. And the same devotion, the same self-denial and sacrifice, the same subjection to the claims of the word of God, is to be manifest in His disciples. MH 502"
"But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you."
Both passages emphasize prioritizing God's will and purpose above all else. Matthew 6:33 is a clear expression of the principle that EGW elaborates on.
"“Ye know,” says Peter, “that ye were not redeemed with corruptible things, as silver and gold.” 1 Peter 1:18 . Oh, had these been sufficient to purchase the salvation of man, how easily it might have been accomplished by Him who says, “The silver is Mine, and the gold is Mine”! Haggai 2:8 . But the sinner could be redeemed only by the precious blood of the Son of God. Those who, failing to appreciate this wonderful sacrifice, withhold themselves from Christ's service, will perish in their selfishness. MH 502.1"
"Forasmuch as ye know that ye were not redeemed with corruptible things, as silver and gold, from your vain conversation received by tradition from your fathers;"
EGW directly quotes 1 Peter 1:18.
"The silver is mine, and the gold is mine, saith the Lord of hosts."
EGW directly quotes Haggai 2:8.
"What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own? For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God’s."
Both passages discuss the concept of being bought with a price, although EGW focuses on the blood of Christ while 1 Corinthians speaks more generally about being bought with a price and belonging to God. The connection is thematic and supports EGW's point.
"There is a picture representing a bullock standing between a plow and an altar, with the inscription, “Ready for either,” ready to toil in the furrow or to be offered on the altar of sacrifice. This is the position of the true child of God—willing to go where duty calls, to deny self, to sacrifice for the Redeemer's cause. MH 502.5"
"I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service."
The EGW passage uses the image of a bullock ready for either plowing or sacrifice to illustrate the willingness to serve God in any capacity. This directly parallels the concept of presenting one's body as a living sacrifice in Romans 12:1. The connection is strong and meaningful.