"Very many feel impatient and jealous because they are frequently disturbed with warnings and reproofs which keep their sins before them. Says the True Witness: “I know thy works.” The motives, the purposes, the unbelief, the suspicions and jealousies may be hid from men, but not from Christ. The True Witness comes as a counselor: “I counsel thee to buy of Me gold tried in the fire, that thou mayest be rich; and white raiment, that thou mayest be clothed, and that the shame of thy nakedness do not appear; and anoint thine eyes with eyesalve, that thou mayest see. As many as I love, I rebuke and chasten; be zealous therefore, and repent. Behold, I stand at the door, and knock: if any man hear My voice, and open the door, I will come in to him, and will sup with him, and he with Me. To him that overcometh will I grant to sit with Me in My throne, even as I also overcame, and am set down with My Father in His throne.” 3T 256"
"As many as I love, I rebuke and chasten: be zealous therefore, and repent."
The EGW passage directly quotes Revelation 3:19 and other verses from the Laodicean message, making it a clear explicit allusion.