The Son now has the power to give eternal life to people because his Father YHWH gave him that power by giving him life within himself.
John 5:26 For as the Father hath life in himself; so hath He given to the Son to have life in himself;
How does the Father have life in Himself? GOD!
The Son in the Incarnation had to give up having the ability to give eternal life. It was given to him at some point in time and it allows him to then impart that life to others. He has also been given that authority by the only true God.
Its the other way around. Eternal life did not always at all times have eternal life to give. For He was to lose that ability when he had to make Himself become as a man!
In the Incarnation He denied Himself all rights to the powers of Deity in order to make Himself become like one of us. For, He had been existing in the Form of God prior to the Incarnation!
Philippians 2:6-8 (take your pick of translations. I'll use this one for now)
Who, being in very nature God,
did not consider equality with God something to be used to his
own advantage;
rather, he made himself nothing
by taking the very nature of a servant,
being made in human likeness.
And being found in appearance as a man,
he humbled himself
by becoming obedient to death—
even death on a cross!
Once in His entered into his new lowered state (which was his required state to redeem man) the Father granted Him eternal life to give. For when He made Himself become as a man He had to leave behind all His powers of Deity in order to be tempted and suffer as a man would.
The union they have is not one of person or deity. It is one of purpose, goals, character, etc. All believers are to have the same oneness (union/oneness) as the Father and Son have.
What many miss? Is that to have two natures does not require having a human body!
First of all.. Jesus explained the essence of the God's Deity.
"God is spirit, and those who worship Him must
worship in spirit and truth.” (John 4:24)
You do realize that God is not soul. He is "spirit." They were two different immaterial invisible essences to the Lord God of Israel prior to the Incarnation! .
In the OT, we see in Scripture the Lord God of Israel possessing TWO NATURES! Yes, before the Incarnation! Before taking on sinless human flesh to tabernacle within!
How was that?
Leviticus 26:10-12
'You will eat the old supply and clear out the old because of the new.
Moreover, I will make My dwelling among you, and My soul (God is spirit!)
will not reject you.'I will also walk among you and
be your God, and you shall be My people."
Judges 10:16
And they began to remove the foreign gods from their midst
and to serve Jehovah, so that his soul became impatient
because of the trouble of Israel." (two natures!)
Psalm 11:5
Jehovah himself examines the righteous one as well as the wicked one,
and anyone loving violence his soul certainly hates." (two natures!)
Isaiah 1:14
Your New Moon festivals and your appointed feasts my soul hates.
They have become a burden to me; I am weary of bearing them."
God is spirit! (John 4:24) Not, soul.
That means the Lord God of Israel possessed two natures in union even prior to the Incarnation! In the Incarnation the Lord God's soul entered the body born of Mary, and He refused to retain His right to the full powers of Deity that He had previously operated with as the Lord God of Israel! For he had to make Himself to be as a man. If not as a man? He could not die in our place!
(Those OT passages state that He had two natures before the Incarnation!)
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