"Just as he was entering upon manhood, the time when he must execute his divine mission—the time above all others when he should have been true to God—Samson connected himself with the enemies of Israel. He did not ask whether he could better glorify God when united with the object of his choice, or whether he was placing himself in a position where he could not fulfill the purpose to be accomplished by his life. To all who seek first to honor Him, God has promised wisdom; but there is no promise to those who are bent upon self- pleasing. PP 563.1"
"If any of you lack wisdom, let him ask of God, that giveth to all men liberally, and upbraideth not; and it shall be given him."
EGW references the principle of asking God for wisdom, which is directly stated in James 1:5.
"But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you."
EGW's statement about seeking first to honor God and the promise of wisdom echoes the principle of seeking first the kingdom of God in Matthew 6:33.
How many are pursuing the same course as did Samson! How often marriages are formed between the godly and the ungodly, because inclination governs in the selection of husband or wife! The parties do not ask counsel of God, nor have His glory in view. Christianity ought to have a controlling influence upon the marriage relation, but it is too often the case that the motives which lead to this union are not in keeping with Christian principles. Satan is constantly seeking to strengthen his power over the people of God by inducing them to enter into alliance with his subjects; and in order to accomplish this he endeavors to arouse unsanctified passions in the heart. But the Lord has in His word plainly instructed His people not to unite themselves with those who have not His love abiding in them. “What concord hath Christ with Belial? or what part hath he that believeth with an infidel? and what agreement hath the temple of God with idols?” 2 Corinthians 6:15, 16 . PP 563.2 At his marriag…
"Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?"
EGW directly quotes 2 Corinthians 6:15, 16, which is a continuation of the thought in verse 14. The passage is used to support her argument against marriages between believers and unbelievers.
"Whether therefore ye eat, or drink, or whatsoever ye do, do all to the glory of God."
EGW discusses doing things with God's glory in view, which aligns with the principle in 1 Corinthians 10:31, even though it's not a direct quote. The connection is thematic and supports her argument for Christian principles guiding marriage.
"another. His revenge, in the wasting of all the fields and vineyards of the Philistines, provoked them to murder her, although their threats had driven her to the deceit with which the trouble began. Samson had already given evidence of his marvelous strength by slaying, singlehanded, a young lion, and by killing thirty of the men of Askelon. Now, moved to anger by the barbarous murder of his wife, he attacked the Philistines and smote them “with a great slaughter.” Then, wishing a safe retreat from his enemies, he withdrew to “the rock Etam,” in the tribe of Judah. PP 563.4"
"And he smote them hip and thigh with a great slaughter: and he went down and dwelt in the top of the rock Etam."
EGW directly references and quotes Judges 15:8.