Jesus Himself, when He walked the earth as a man, was fully God and fully man. We Christians are being made like Jesus ~ being conformed to Him ~ and one day will be fully like Him. Scripture is filled with like concepts of ongoing construction:
Jesus Himself, when He walked the earth as a man, was fully God and fully man.
You're unscriptural statement, that religious commentators like to quote, has it's own error built in.
He could not have been 'fully man', because man was fully sinful, when He came into the world.
The soul is not the body, and the body is not the soul: the 'two natures' are of two different things, one nature is of the soul and one nature is of the body.
The soul is one nature, celestial, and the body is one nature, terrestrial. (1 Cor 15)
We are not our bodies. We are our souls in bodies.
Jesus was fully God, fully in a body of flesh:
For in him dwelleth all the fulness of the Godhead bodily.
Every spirit that confesseth that Jesus Christ is come in the flesh is of God.
He was the Word
made flesh, made of a woman: A body was prepared for the God of Israel from the flesh of a woman by the operation of the Spirit, even as Even was made of the flesh of a man. (1 Cor 11:8)
In that He was
made a little lower than angels, it was that He was begotten of God into a man's body on earth, not that we was made 'fully man'. He remained fully the God of Israel, yet now in a body made of a woman, after the Spirit
Eve was not the mother of Jesus, neither was He her Son, because Jesus was not the body, but rather the Lord in a body. Eve was not the mother of God, which would have been the case, if the Son had been fully man, not just
made of the seed of David according to the flesh, but born of a woman by the seed of man
So it was with the first Adam: The body was
made of the dust of the earth, but a living soul was born in that body by the breath of God, and so Scripture calls Adam
the son of God. (Luke 3:38)
Man is the soul, not the body. The body returns to the dust, from whence it came, but the soul is God's to judgment.
Adam was made a living soul by the breath of God, not by the body. Jesus
was made a quickening Spirit by God in a body prepared for Him, not by the body prepared.
The first Adam was the first living soul in a body made of the dust, and the Second Adam was the Lord Himself in a body made of flesh.
He was made
in the likeness of sinful flesh, but not made full man, because he was not born of the seed of sinful man, but only His body was made of that seed according to the flesh: the flesh of Mary, who was of the line of David.
Sinful man is a corrupted soul with a sinful nature. Jesus, therefore, was not 'fully man'. He was fully in a body of man.
With the transgression of Adam, the soul which had been of divine nature, became fully sinful in nature. Adam was not part divine and part sinful in nature after His transgression. If so, then all souls born into the world of the seed of Adam, would be partly divine and sinful, partly celestial and partly terrestrial. So, that claiming to have two-natures in one soul is nothing new, nor special to God.
In that we are changed on this earth, our soul is changed from sinful in nature to divine in nature: our soul becomes a new creature in Christ Jesus:
Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new. And all things are of God.
If our souls remain partly sinful in Christ, then all things have not become new and of God, which is contrary to Scripture.
With the transgression of Adam, the soul became sinful, and the body became mortal.
With the reconciliation to God by the Second Adam, the soul becomes divine
once again, as in the beginning before transgression, which is no more imputed to that soul, which yet inhabits a mortal body: a son of God born again of the Spirit. A living soul in a sinful body.
That is the truth of the two natures, which Christians have, but not are: We have the divine nature of our soul, and the sinful nature of our body. The unbeliever still has one nature: sinful soul and sinful body, having not the Spirit of God in their souls, with Christ formed in them to become fully and completely new living creatures: A living soul become a son of God on earth in mortal body. (John 1:12)
Neither the Son of God coming in the flesh had two-natures in His soul, one sinful, the other divine, and so neither do the sons of God now made after His likeness and in His image: The old man of sin is the old sinful soul completely dead and buried
in the likeness of his resurrection.
That redeemed soul is now of a spiritual nature, the divine nature, and sits in heavenly places, while yet living in a natural body of sinful nature, that is not yet redeemed. The soul is spiritual and divine, being born of the Spirit, and the body is natural and sinful, still made of sinful flesh.
With the resurrection and redemption of the purchased possession, both the soul and the body will be spiritual, divine, and celestial with the Lord forever, even as He is now, and then shall come to pass, that the whole body of Christ yet on earth, and in the earth, shall be
in the likeness of His resurrection.
Not partly divine and partly sinful soul will ever inhabit a wholly spiritually resurrected body.
We are not bodies with souls. We are souls with bodies. And the only people on earth having two different natures are the people of God: the divine nature of the soul walking in the flesh of sinful.
Jesus was made to walk in
the likeness of sinful flesh, so that them who believe on Him could become sons of God, born in the likeness of Christ, yet made still to walk in sinful flesh: Christians.
The Second Adam, Jesus Christ, had one nature on earth, even as the first Adam: the divine soul of God, and the uncorrupted flesh of a body, prepared for Him of a woman by the Spirit. Yet without transgression.
Every soul born of Adam thereafter had one nature by transgression: a sinful soul, and a corrupted body of flesh.
The unbelievers on earth continue as such seed of Adam. But believers in Jesus now continue as the Second Adam, howbeit in sinful flesh: two different natures. One for soul, one for body.
At the resurrection, they all shall be of one nature, soul and body, even as the risen God of Israel in the likeness of His resurrection.
If they do not transgress after the similitude of Adam's, which is to neither confess nor repent.