1 Tim 3:16 And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.
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1 John 5:6-7 ...And it is the Spirit that testifies because the Spirit is truth for there are three that testify in heaven, Father, Word, also the Holy Spirit: likewise these three are one.
The spirit of the Father, the Son and the Holy Spirit are one Spirit.
John 4:24 God is a Spirit: and they that worship him must worship him in spirit and in truth.
Notice it says these three, are one. Not one God, in or and three persons, but one God.
The Father testifies through the Son by the Holy Spirit (John 5:37, 15:26).
Bear witness or testify
John 5:32 There is another that testifies of me; and I know that the witness which he witnesseth of me is true.
John 5:37 And the Father himself, which hath sent me, testifies of me.
John 8:18 I am one that testifies of myself, and the Father that sent me testifies of me.
John 15:26 But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me:
Romans 8:16 The Spirit itself testifies with our spirit, that we are the children of God:
Jesus sends the (Holy Spirit) from the Father, even the Spirit of Truth, see 1 John 5:6-7
John 15:26 But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me:
Jesus prays that the Father will send another Comforter (Holy Spirit).
John 14:16 And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever;
Jesus himself sent the Holy Spirit
John 14:18 I will not leave you comfortless: I will come to you.
John 16:7 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.
Jesus himself gives the Holy Spirit to his Apostles
John 20:22 And when he had said this, he breathed on them, and saith unto them, Receive ye the Holy Ghost:
The Father Himself sent the Holy Spirit
Luke 11:13 If ye then, being evil, know how to give good gifts unto your children: how much more shall your heavenly Father give the Holy Spirit to them that ask him?
Here, God, the Father sends the Spirit of His Son
Gal 4:6 And because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father.
Here we receive the Holy Spirit through Christ alone
Acts 2:38 Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
Here the Spirit of God is the Spirit of Christ
Rom 8:9 But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his.
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The Holy Spirit is the power of God manifest in us, much like the Son of God is the manifestation of God in the flesh. The Holy Spirit is not a person.
2 Cor 1:22 Who hath also sealed us, and given the earnest (or down payment) of the Spirit in our hearts.
Eph 1:13-14 In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise, Which is the earnest of our inheritance until the redemption of the purchased possession, unto the praise of his glory.
It is His Spirit of truth that is also our testimony and the down payment or earnest that we are given unto our redemption which is our Salvation.
Eph 1:17 That the God of our Lord Jesus Christ, the Father of glory, may give unto you the spirit of wisdom and revelation in the knowledge of him:
His Spirit of truth also enables us to have a real knowledge of our Redeemer Christ Jesus.
Romans 15:13 Now the God of hope fill you with all joy and peace in believing, that ye may abound in hope, through the power of the Holy Ghost.
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It is possible to believe in two or three God's, or one God, but not both!
You may not read through this or spend the time to digest it at all
I put about four hours into this study, and well it sure blessed me!
If you do read this I hope you enjoy it as much as I did!