It is a wonderful and encouraging truth that Gabriel holds an extraordinarily high position in the universe as a powerful agent of God, although he is consistently referred to as the angel who is next in rank and honor to the Son of God, rather than being divine himself linkDA 234.2 TA 241.3 HLv 148.4.

To the question of Zacharias, the angel said, “I am Gabriel, that stand in the presence of God; and am sent to speak unto thee, and to show thee these glad tidings.” Five hundred years before, Gabriel had made known to Daniel the prophetic period which was to extend to the coming of Christ. The knowledge that the end of this period was near had moved Zacharias to pray for the Messiah's advent. Now the very messenger through whom the prophecy was given had come to announce its fulfillment. The words of the angel, “I am Gabriel, that stand in the presence of God,” show that he holds a position of high honor in the heavenly courts. When he came with a message to Daniel, he said, “There is none that holdeth with me in these things, but Michael [Christ] your Prince.” Daniel 10:21. Of Gabriel the Saviour speaks in the Revelation, saying that “He sent and signified it by His angel unto His servant John.” Revelation 1:1. And to John the angel declared, “I am a fellow servant with thee and with thy brethren the prophets.” Revelation 22:9 R. V. Wonderful thought—that the angel who stands next in honor to the Son of God is the one chosen to open the purposes of God to sinful men

DA 98.4-99.1

It was Gabriel, the angel next in rank to the Son of God, who came with the divine message to Daniel. It was Gabriel, “His angel,” whom Christ sent to open the future to the beloved John; and a blessing is pronounced on those who read and hear the words of the proph...

DA 234.2

Had Christ come in his former glory, humanity could not have endured the sight. When the angel Gabriel came to Daniel to give him skill and understanding, Daniel could not look upon him. The angel had to reveal himself as a man before he could speak with the prophet. Thus we see the wisdom of God in planning that Christ shoul...

YI February 22, 1900, par. 6

In the supreme crisis, when heart and soul are breaking under the load of sin, Gabriel is sent to strengthen Him. And while the angel supports His fainting form, Christ takes the bitter cup and consents to drink ...

12LtMs, Ms 42, 1897, par. 15

... and with thy brethren the prophets.” Revelation 22:9 R. V. Wonderful thought—that the angel who stands next in honor to the Son of God is the one chosen to open the purposes of God to sinful men.—The Desire of Ages, 99

TA 241.3

Gabriel is consistently recognized as an exalted being, a mighty angel, and a direct messenger from the heavenly courts linkCCh 54.1 CD 225.1 14LtMs, Ms 138, 1899, par. 29. He is the angel who stands in the presence of God, signifying his exceptional trust and closeness to the Almighty linkDA 98.4-99.1 TA 152.2 16LtMs, Ms 112, 1901, par. 3.

This honored messenger was commissioned to deliver messages concerning profound prophetic truths, such as explaining to Daniel the twenty-three hundred days and the period of the seventy weeks, thereby bringing skill and understanding to the prophet linkPr 147.2 HLv 147.1 DA 233.1 RH February 9, 1897, par. 7. During the pivotal crisis in Gethsemane, Gabriel was sent to sustain the divine Sufferer, strengthening Christ as He consented to drink the bitter cup of human woe linkST December 9, 1897, par. 2 12LtMs, Ms 42, 1897, par. 15 DA 693.3.

Gabriel’s mission is regarded as intensely important and honorable; in the practical duties of life, a woman doing humble household tasks can be doing the work of God just as surely as was Gabriel when sent to the prophets linkAH 24.2 T21 117.3. Before the birth of John the Baptist, the angel Gabriel was sent directly from heaven to provide special instruction to the parents regarding temperance, giving a direct discourse on the principles of health reform to prepare the child for his significant mission linkCTBH 38.4 CH 72.2 CD 70.4. His exalted standing means that those who receive Christ and believe in Him will be given power to become the sons of God and associate with the highest dignitaries in heaven, uniting with Gabriel, the cherubim, seraphim, angels, and the archangel linkTA 285.2 11LtMs, Ms 41a, 1896, par. 19 11LtMs, Ms 41b, 1896, par. 14.

That is a very keen observation, and you are absolutely right 🧐! The sources provided do not state that Gabriel is divine because the writings of Ellen G. White consistently portray him as the highest-ranking created being among the angels, not as a member of the Godhead.

Here is a breakdown of why the quotes affirm his exalted but non-divine status:

1. Rank, Not Deity: Gabriel is repeatedly identified as "the angel next in rank to the Son of God" linkDA 234.2 TA 241.3. This position means he holds "a position of high honor in the heavenly courts" linkDA 98.4 16LtMs, Ms 112, 1901, par. 3 standing closest to God's presence, but he is still clearly separate and subordinate to the Son of God Daniel 10:21 linkDA 234.2.
2. Fellow Servant: When Gabriel delivered messages to the beloved John, he did not accept worship or claim divinity, but instead declared, "I am a fellow servant with thee and with thy brethren the prophets" Revelation 22:9 linkTA 241.3. The term "fellow servant" solidifies his identity as a created messenger working alongside humanity linkTA 241.3.
3. Messenger Status: He is called "Heaven's delegated messenger" linkCCh 54.1 and "the very messenger through whom the prophecy was given" linkDA 98.4. Even during the supreme crisis in Gethsemane, he was sent from the heavens to strengthen Christ, acting as an agent of the Father's love, not as the source of that divine power linkDA 693.3 ST December 9, 1897, par. 2.

Therefore, Gabriel is a mighty angel and the chief of the heavenly intelligences chosen to open God's purposes to humanity, yet he is clearly distinguished from the divine nature of God and Christ linkTA 241.3.