Understanding the 3 Part God; His Trinity of the Father, the Son and the Holy Spirit:
THE FATHER SURROUNDS ALL THINGS: The Son is His Soul, His personality and His Mind; while the Holy Spirit is His Spirit. The Father never took physical form but His Personality (Soul) did:
1John 4:  No man hath seen God at any time. If we love one another, God dwelleth in us, and his love is perfected in us.
Why? Because Jehovah is a Spirit:
John 4: 23 But the hour cometh, and now is, when the true worshippers shall worship the Father in spirit and in truth: for the Father seeketh such to worship him.
24 God is a Spirit: and they that worship him must worship him in spirit and in truth.
God the Father is JEHOVAH GOD, our Lord Jesus Christ is HIS IMAGE:
Colossians 1:  Who hath delivered us from the power of darkness, and hath translated us into the kingdom of his dear Son:
 In whom we have redemption through his blood, even the forgiveness of sins:
 Who is the image of the invisible God, the firstborn of every creature:
 For by him were all things created, that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions, or principalities, or powers: all things were created by him, and for him:
 And he is before all things, and by him all things consist.
 And he is the head of the body, the church: who is the beginning, the firstborn from the dead; that in all things he might have the preeminence.
 For it pleased the Father that in him should all fulness dwell;
God the Father has shown HIMSELF to all the world in the form of and as Jesus. Jesus is Whom God the Father truly is (His personality):
God the Father is a Spirit surrounding all things and is everywhere OMNIPRESENT: All powerful OMNIPOTENT, and ALL knowing OMNISCIENT:
He is everywhere at once, He sees everything all the time, His power is without human comprehension nor explanation. He exists outside of time and sees all events over His Creation as He Wills without any constraint of time.
Jeremiah 23:24 Am I a God at hand, saith the LORD, and not a God afar off? Can any hide himself in secret places that I shall not see him? saith the LORD. Do not I fill heaven and earth? saith the LORD.
Psalms 15:3 The eyes of the LORD are in every place, beholding the evil and the good.
Hebrew 4:13 Neither is there any creature that is not manifest in his sight: but all things are naked and opened unto the eyes of him with whom we have to do.
God's Image and personality is also referred to as HIS Word (His Living Word) and HE (our Lord Jesus Christ) spoke the worlds into existence:
21 And God created great whales, and every living creature that moveth, which the waters brought forth abundantly, after their kind, and every winged fowl after his kind: and God saw that [it was] good.
26 And God said, Let us make man in our image, after our likeness: and let them have dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth, and over every creeping thing that creepeth upon the earth.
28 And God blessed them, and God said unto them, Be fruitful, and multiply, and replenish the earth, and subdue it: and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that moveth upon the earth.
29 And God said, Behold, I have given you every herb bearing seed, which [is] upon the face of all the earth, and every tree, in the which [is] the fruit of a tree yielding seed; to you it shall be for meat.
Hebrews 11:1: Now faith is the substance of things hoped for, the evidence of things not seen. For by it the elders obtained a good report. Through faith we understand that the worlds were framed by the word of God, so that things which are seen were not made of things which do appear.
Jesus, the Son, the Soul of God and God the Father specifically:
I Corinthians 8:  But if any man love God, the same is known of him.
 As concerning therefore the eating of those things that are offered in sacrifice unto idols, we know that an idol is nothing in the world, and that there is none other God but one.
 For though there be that are called gods, whether in heaven or in earth, (as there be gods many, and lords many,)
 But to us there is but one God, the Father, of whom are all things, and we in him; and one Lord Jesus Christ, by whom are all things, and we by him.
Hebrews 1:1 God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets, Hath in these last days spoken unto us by his Son, whom he hath appointed heir of all things, by whom also he made the worlds; Who being the brightness of his glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high; Being made so much better than the angels, as he hath by inheritance obtained a more excellent name than they. For unto which of the angels said he at any time, Thou art my Son, this day have I begotten thee? And again, I will be to him a Father, and he shall be to me a Son? And again, when he bringeth in the firstbegotten into the world, he saith, And let all the angels of God worship him.
As our bodies surround and contain our souls and spirits: So does God the Father surround all things and contains His Soul (Jesus) and His Spirit.
I Peter 1:  Elect according to the foreknowledge of God the Father, through sanctification of the Spirit, unto obedience and sprinkling of the blood of Jesus Christ: Grace unto you, and peace, be multiplied.
Can you see how He exists and works as the Great Three in One just as He made us to exist and work as three in one.
3 THAT BEAR WITNESS IN HEAVEN & 3 THAT BEAR WITNESS IN EARTH
I John 5: 4 For whatsoever is born of God overcometh the world: and this is the victory that overcometh the world, even our faith. Who is he that overcometh the world, but he that believeth that Jesus is the Son of God? This is he that came by water and blood, even Jesus Christ; not by water only, but by water and blood. And it is the Spirit that beareth witness, because the Spirit is truth. For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one. And there are three that bear witness in earth, the Spirit, and the water, and the blood: and these three agree in one. If we receive the witness of men, the witness of God is greater: for this is the witness of God which he hath testified of his Son. He that believeth on the Son of God hath the witness in himself: he that believeth not God hath made him a liar; because he believeth not the record that God gave of his Son.
Remember this: Christ's Birth provided real life to all who want it.
Christ's Death ended death for all whom believe on and Trust Only in Him.
Our Lord's explanation of the NEW Birth gives a hint:
John 3:  There was a man of the Pharisees, named Nicodemus, a ruler of the Jews:
 The same came to Jesus by night, and said unto him, Rabbi, we know that thou art a teacher come from God: for no man can do these miracles that thou doest, except God be with him.
 Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God.
 Nicodemus saith unto him, How can a man be born when he is old? can he enter the second time into his mother's womb, and be born?
 Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God.
 That which is born of the flesh is flesh; and that which is born of the Spirit is spirit.
 Marvel not that I said unto thee, Ye must be born again.
 The wind bloweth where it listeth, and thou hearest the sound thereof, but canst not tell whence it cometh, and whither it goeth: so is every one that is born of the Spirit.
Read all of Christ’s Words and then go back to this: John 3:5: Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God.
Water is the physical birth.
The Blood of Christ makes possible the New Birth.
The Spirit Causes the New Birth.
Then our water baptism demonstrates our belief in our hearts for others to see and begins our new life obeying His Great Commission.
The Spirit bore witness at Christ’s birth (water):
The Spirit bore witness at his Baptism and the START OF HIS MINISTRY and PURPOSE FOR COMING:
Matthew 3: 13 Then cometh Jesus from Galilee to Jordan unto John, to be baptized of him. But John forbad him, saying, I have need to be baptized of thee, and comest thou to me? And Jesus answering said unto him, Suffer it to be so now: for thus it becometh us to fulfil all righteousness. Then he suffered him. And Jesus, when he was baptized, went up straightway out of the water: and, lo, the heavens were opened unto him, and he saw the Spirit of God descending like a dove, and lighting upon him: And lo a voice from heaven, saying, This is my beloved Son, in whom I am well pleased.
Why do you think Jesus said for thus it becometh us to fulfil all righteousness. Because God wanted the hardened, vain hearts of national Israel to see every single prophecy fulfilled which God gave Israel further condemning them when they reject our Lord Jesus Christ.
At His Death (water and blood) the Spirit bore witness:
Call to mind please the Old Testament Sacrifices; the bulls, goats, lambs:
Hebrews 9:11 But Christ being come an high priest of good things to come, by a greater and more perfect tabernacle, not made with hands, that is to say, not of this building; Neither by the blood of goats and calves, but by his own blood he entered in once into the holy place, having obtained eternal redemption for us. For if the blood of bulls and of goats, and the ashes of an heifer sprinkling the unclean, sanctifieth to the purifying of the flesh: How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God? And for this cause he is the mediator of the new testament, that by means of death, for the redemption of the transgressions that were under the first testament, they which are called might receive the promise of eternal inheritance. For where a testament is, there must also of necessity be the death of the testator. For a testament is of force after men are dead: otherwise it is of no strength at all while the testator liveth.
The Spirit through His Word reveals this to all who seek God’s Truth:
He bears witness.
Christ's Blood was the final sacrifice for all who trust only in Him and His sacrifice for us.
Hebrews 10:15 But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God; From henceforth expecting till his enemies be made his footstool. For by one offering he hath perfected for ever them that are sanctified. Whereof the Holy Ghost also is a witness to us: for after that he had said before, This is the covenant that I will make with them after those days, saith the Lord, I will put my laws into their hearts, and in their minds will I write them; And their sins and iniquities will I remember no more. Now where remission of these is, there is no more offering for sin.
Another consideration should be given to Nicodemus' Example:
"Unless one is born of water and of the Spirit, he cannot enter the kingdom of God.” Jesus is having a conversation with Nicodemus, who is a Pharisee. He is speaking in relation to the Pharisee’s teaching "to be born of water meant to be born physically". Proof of this is Nicodemus’ remark to Jesus asking if someone can go back into the womb while he is old. Nicodemus thought to be born again meant a physical birth. Jesus then proceeds to say, “Unless one is born of water and the Spirit, you cannot enter the kingdom of God.” Nicodemus, who was a Pharisee, believed like the other Jews that because he was born a Jew he would automatically enter into the kingdom of God. Jesus reproves him clearly.
Jesus clearly means the the water indicates flesh or physical birth. “that which is flesh is flesh” Jesus then explains the difference to Nicodemus of already having a physical birth that comes first, and the need of a second birth from the Holy Spirit to enter the kingdom. He is contrasting the natural to the spiritual.
Jesus Christ Himself is the one who came by water and by blood—not by the water only, but by the water and the blood. The Spirit bears witness to this, for the Spirit is the truth. The witness therefore is a triple one—the Spirit in our own hearts, the signs of the water of baptism and the blood of atonement—and they all say the same thing as a triple testimony.
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