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We understand the Trinity, as applied to the Godhead, to consist of the Father, the Son, and Holy Spirit. The two former to be personal, spiritual beings, eternal, and infinite in all their ways and attributes. The Son is of the Father, equal in glory and honor, but in some measure subject in authority. The Holy Spirit is the representative of the Deity in all parts of the universe. These supreme beings we cannot comprehend or measure."
[George C. Tenney], “Bible Student: Queries,” Bible Echo and Signs of the Times, December 15, 1891, 378, 379
"We understand the Trinity, as applied to the Godhead, to consist of the Father, Son, and Holy Spirit. The two former to be personal, spiritual beings … The Holy Spirit is the representative of the Deity in all parts of the universe. These supreme Beings we cannot comprehend or measure." … “There is certainly nothing incongruous in the idea of the Spirit being a personal representative, hence saying that the Spirit is the representative of the Father and Son does not deny his personality as our friend would make out. He occupies in our minds an exalted place with Deity; and the paragraph in question speaks of him as a supreme Being”
Bible echo and signs of the times page 112 vol 7 no. 7, April 1 1892.
"To this extent do divine beings show their love to believers. The Father, in his abounding grade, adopts; the Son, in whom dwells all the fullness of the Godhead bodily, humbled himself and became obedient to the death of the cross to redeem and deliver them; and the Holy Spirit witnesses that we are the children of God."
Uriah Smith, “It Doth Not Yet Appear,” Review and Herald, vol 76, No. 49
December 5, 1899, 789.
“there must have been, according to Rom. 16:25, R.V., "times eternal," when there were no worlds; no created being, not even an angel; in fact, there were only three beings — God the Father, God the Son, and God the Holy Spirit; these three persons in the Godhead.“
Review and Herald, Vol. 78, No. 1. January 1, 1901. p. 2
On page 1 is an article by Ellen White “Canvassing, A Branch Of God's Work“.
"Name the three Beings that unite in sending a blessing to the church [Rev 1]."
Stephen N. Haskell, The Story of the Seer of Patmos, Nashville, TN: Southern Publ. Assn., 1905, 374
“You are born unto God, and you stand under the sanction and the power of the three holiest beings in heaven”
Ellen White, 21 LtMs, Ms 95, 1906, par. 29. For more info on this quote see https://whiteestate.org/about/issues1/ref-lib/add-docs/trinity/ OR https://media1.whiteestate.org/legacy/issues/The-Trinity.pdf
"There are three Beings in the Godhead: God, the Father; Jesus Christ, the Word; and the Holy Spirit. “These three are one.” 1 John 5:7."
Review and Herald, December 15, 1910, 8. On page 2 is an article by Ellen White "Let Your Light So Shine Before Men". http://documents.adventistarchives.org/Periodicals/RH/RH19101215-V87-50.pdf
In an article titled “The Trinity” W.R. French wrote “the Godhead is composed of three personal beings and these three are one.” and “To these three, working together for the salvation of man, are equally due our gratitude and praise for the work which they are doing.”
Review and Herald, Vol. 89; Dec. 19, 1912; No. 51. On pg. 5-6. On page 3-4 an article from Ellen White “God’s Means for Diffusing Light” https://documents.adventistarchives.org/Periodicals/RH/RH19121219-V89-51.pdf