Let's notice a few points about this individual called Melchisedec:
Hebrews 7: 3-8
(1) He met Abraham while he was returning from the slaughter of the Kings –
Verse 1
(2) He has no Father and no Mother - verse 3
(3) He is without descent, or without record, genealogy - verse 3
(4) He has no beginning or end of days; he lives forever - verse 3
(5) He is "like" (similar) unto the Son of God - verse 3
(6) He is a person: "consider how great this man was" -verse 4
(7) Once again, he had no genealogy - verse 6
(8) It is witnessed that he still lives - verse 8
We are trying to determine who this gentlemen really is. Paul gives us a lot of information in the first 8 verses. But notice verses 15-16:
Hebrews 7:15-16
(15) And it is yet far more evident: for that after the similitude of Melchisedec there ariseth another priest, (16) Who is made, not after the law of a carnal commandment, but after the power of an endless life.
In other words, there arose another priest besides Melchisedec the Priest of the most high God. The word "another" in the Greek means "different." This means that this other priest who arose was different from Mel. Who was this other priest?
Hebrews 7:17
(17) For he testifieth, Thou (Jesus) art a priest for ever after the order of Melchisedec.
(See also Hebrews 5:5-6)
That other Priest was Jesus. Note that it says Jesus came after the order "of" Melchisedec. Jesus was not Melchisedec; rather he came after Melchisedec's order. Verse 3 tells us this as well, saying that Jesus, the Son of God, was "like" or similar to Melchisedec. More proof is listed in the above list:
-Jesus had a mother, Melchisedec did not.
-Jesus' genealogy is recorded in Matthew 1 and Luke 3, Melchisedec's is not recorded.
How is he similar to Jesus? Well both are Priest's, and both have no beginning and no ending. Could it be that Melchisedec was God the Father? Not likely, for verse 1 told us that Melchisedec met Abraham after the slaughter. Yet, no man has ever seen God:
John 1:18
(18) No man hath seen God at any time; the only begotten Son, which is in the bosom of the Father, he hath declared him.
Was Abraham a man? Why yes, he was. So he likewise never saw God the Father. Who are we left with? We learned above that there are three that bear record in the heavenly Godhead, the Father, the Son and the Holy Spirit. If in this chapter we have one who, like God, has no beginning and no ending, it must therefore be the Holy Spirit. If it not the Holy Spirit, yet as seen it is neither Jesus nor God the Father, who was he?
Psalms 90:2
(2) Before the mountains were brought forth, or ever thou hadst formed the earth and the world, even from everlasting to everlasting, thou art God.
Only God is from everlasting to everlasting, having no beginning and no ending. He is "eternal." Now verse 4 tells he is was a "man" meaning he was a person. A person, we know, has a personality, else he could not, by definition, be a "person." This means that he is an eternal person. And since Melchisedec is clearly not God the Father and not Jesus Christ, he must be GOD the Holy Spirit, for only God is an eternal person (no beginning and not ending).
By the way, he is not an angel either, because verse 3 says he has no beginning, but we know angels had a beginning, for they were created.
This, along with our previous sections, would settle once and for all who the Holy Spirit really is. Since the individual called Melchisedec is the Holy Spirit, we are left with the following logical conclusions:
(a) The Holy Spirit is a separate being from the Father and from the Son, not just some active force.
(b) The Holy Spirit also has a body himself while being separate from the Father and from the Son.
(c) The Holy Spirit has no beginning and no ending, a quality only God can posses. Therefore he also is God, as seen also in our previous section.
The name "Melchisedec" literally means:
-King of Righteousness
-King of Peace
This fits perfectly with the Holy Spirit. He convicts the world of righteousness:
John 16:7-8
(7) Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you. (8) And when he is come, he will reprove the world of sin, and of righteousness, and of judgment:
And he brings forth peace:
Galatians 5:22
(22) But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith...
Romans 14:17
(17) For the kingdom of God is not meat and drink; but righteousness, and peace, and joy in the Holy Ghost.
The following quote is for our Adventist brethren to consider:
"It was Christ that spoke through Melchisedec, the priest of the most high God. Melchisedec was not Christ, but he was the voice of God in the world, the representative of the Father. And all through the generations of the past, Christ has spoken; Christ has led his people, and has been the light of the world." -The Review and Herald, Feb 18, 1890, How to Meet a Controverted Point of Doctrine.
Our case was first proven by scripture. Now we further confirm these points in the writings of the Spirit of Prophecy for our Adventist brothers and sisters. It's clear, according to the above quote, that Melchisedec was not Christ himself. Rather, Melchisedec was one by which Christ spoke through. Then we are shown that Melchisedec is not the Father, rather, he is the "representative" of the Father upon the earth, the "voice of God in the world." Need I say more? If he is not either of these two, yet he had no beginning and no ending, something which belongs to God alone, he must be the Spirit of God... the Holy Ghost, separate, divine and a being himself.
Next: Holy Spirit is the Soul of Christ, not a Third Person?