Revelation 1:4 John to the seven churches which are in Asia: Grace be unto you, and peace, from him which is, and which was, and which is to come; and from the seven Spirits which are before his throne; 5 And from Jesus Christ, who is the faithful witness, and the first begotten of the dead, and the prince of the kings of the earth. Unto him that loved us, and washed us from our sins in his own blood,...-John

PROBLEM 1: If the 7 Spirits are the saved from each of the 7 churches, we have a greeting that includes the saved church members greeting the church(themselves included), which doesn't make much sense. But we will clear this up later...

Revelation 1:20 The mystery of the seven stars which thou sawest in my right hand, and the seven golden candlesticks. The seven stars are the angels of the seven churches: and the seven candlesticks which thou sawest are the seven churches.-Jesus

“The work of the minister represented by the seven stars is a high and sacred work.” -The Review and Herald, May 31, 1887 & PaM 40.2

“Christ is represented as holding the seven stars in His right hand. This assures us that no church faithful to its trust need fear coming to nought, for not a star that has the protection of Omnipotence can be plucked out of the hand of Christ. 'These things saith He that holdeth the seven stars in His right hand.' Revelation 2:1. These words are spoken to the teachers in the church—those entrusted by God with weighty responsibilities.” -AA 586.2-3

Revelation 2:1 Unto the angel of the church of Ephesus write; These things saith he that holdeth the seven stars in his right hand, who walketh in the midst of the seven golden candlesticks;

Revelation 3:1 And unto the angel of the church in Sardis write; These things saith he that hath the seven Spirits of God, and the seven stars; I know thy works, that thou hast a name that thou livest, and art dead.

Revelation 4:2 And immediately I was in the spirit: and, behold, a throne was set in heaven, and one sat on the throne(Jehovah)... 5 And out of the throne proceeded lightnings and thunderings and voices: and there were seven lamps of fire burning before the throne, which are the seven Spirits of God.

Problem 2: If we assume the “lamps” == “candlesticks”, then we have:

Numbers 8:1 And [Jehovah] spake unto Moses, saying, 2 Speak unto Aaron and say unto him, When thou lightest the lamps, the seven lamps shall give light over against the candlestick. 3 And Aaron did so; he lighted the lamps thereof over against the candlestick, as [Jehovah] commanded Moses.

Zechariah 4:1 And the angel that talked with me came again, and waked me, as a man that is wakened out of his sleep. 2 And said unto me, What seest thou? And I said, I have looked, and behold a candlestick[Hebrew: menoraw - chandelier] all of gold, with a bowl upon the top of it, and his seven lamps[Hebrew: nayraw - candle, lamp, light] thereon, and seven pipes to the seven lamps, which are upon the top thereof:

Revelation 5:6 And I beheld, and, lo, in the midst of the throne and of the four beasts, and in the midst of the elders, stood a Lamb as it had been slain, having seven horns and seven eyes, which are the seven Spirits of God sent forth into all the earth.

The "seven eyes" of Jesus == the 7 Spirits of God sent forth into all the earth.

So, what is symbolized by the “seven Spirits of God”? “This is unquestionably simply a designation of the Holy Spirit” -Uriah Smith (full quote below)

“The terms “Holy Ghost”, are a harsh and repulsive translation. It should be “Holy Spirit” (hagion pneuma) in every instance. This Spirit is the Spirit of God, and the Spirit of Christ; the Spirit being the same whether it is spoken of as pertaining to God or Christ. But respecting this Spirit, the Bible uses expressions which cannot be harmonized with the idea that it is a person like the Father and the Son. Rather it is shown to be a divine influence from them both, the medium which represents their presence and by which they have knowledge and power through all the universe, when not personally present. Christ is a person, now officiating as priest in the sanctuary in heaven; and yet he says that wherever two or three are gathered in his name, he is there in the midst. Mt. 18:20. How? Not personally, but by his Spirit. In one of Christ’s discoursed (John 14-16) this Spirit is personified as “the Comforter,” and as such has the personal and relative pronouns, “he,” “him,” and “whom,” applied to it. But usually it is spoken of in a way to show that it cannot be a person, like the Father and the Son. For instance, it is often said to be “poured out” and “shed abroad.” But we never read about God or Christ being poured out or shed abroad. If it was a person, it would be nothing strange for it to appear in bodily shape; and yet when it has so appeared, that fact has been noted as peculiar. Thus Luke 3:22 says: “And the Holy Ghost descended in a bodily shape like a dove upon him.” But the shape is not always the same; for on the day of Pentecost it assumed the form of “cloven tongues like as of fire.” Acts 2:3, 4. Again we read of “the seven Spirits of God sent forth into all the earth.” Rev. 1:4; 3:1; 4:5; 5:6. This is unquestionably simply a designation of the Holy Spirit, put in this form to signify its perfection and completeness. But it could hardly be so described if it was a person. We never read of the seven Gods or the seven Christs.” — (Uriah Smith, Review and Herald, October 28, 1890)

Now, back to Revelation 1:4 “John to the seven churches which are in Asia: Grace be unto you, and peace, from him which is, and which was, and which is to come; and from the seven Spirits which are before his throne; 5 And from Jesus Christ...”

We now see that the greeting to the 7 churches/candlesticks(lampstands) was from: John, Jehovah, the Holy Spirit(Spirit of God/Christ), and Jesus Christ. And, that makes sense :-)