19 For in him all the fullness of God was pleased to dwell,
1 In the beginning was the Word, and the Word was with God, and the Word was God.
14 And the Word became flesh and dwelt among us, and we have seen his glory, glory as of the only Son from the Father, full of grace and truth.
9 For in him the whole fullness of deity dwells bodily,
Who is Jesus?
Jesus is truly God and truly man.
Jesus in His deity is the second person of the Triune God (Yahweh God is One God, three eternally distinct persons: The Father, The Son, The Holy Spirit).
Jesus in His humanity is the second Adam who knew no sin and as sinless man earned the righteousness on God’s chosen people’s behalf required to enter the kingdom God (Hebrews 4:15, Romans 3:21-22).
In Colossians 1:19 Paul writes that in Christ Jesus the fullness of God was pleased to dwell. The word translated “dwell” in the original language means to reside in a home permanently. In Colossians 2:9 and John 1:1,14 we see that the deity of the second person of the Triune God, God the Son, who was with God the Father and is God dwelled permanently in human flesh, though now in His resurrection and ascension it is a glorified physical body.
In the incarnation (By the power of the Holy Spirit God, the virgin Mary supernaturally conceiving Jesus) the eternal God the Son was permanently put into union with human nature. This is what is called the hypostatic union. The one person of Jesus of Nazareth has two distinct natures that are united forever in His person. These two natures are not blended together or conflated but are distinct from one another. Forever the deity of Christ Jesus is united to the humanity of Christ Jesus. Jesus is not two persons, but one person with two distinct natures forever united.
The two distinct natures of the Lord Jesus are required for the Him to endure infinite wrath as infinite God for His people and to earn righteousness under the Law actively and passively as the Second Adam on behalf of His people. His people being all those who embrace His person and work by grace through faith alone.
Jesus is truly holy God, truly perfect man.