If I could interject.....Not that hard to grasp if you look at it this way. HaShem the Father was IN CHRIST (Seed that is SPIRIT, "spittin" image of His Father), reconciling all men unto Him. The flesh man was the husk the Seed was hidden in, and the Seed was the "container" the Father was hidden in.
He said He came to give us life (the Seed) and life everlasting (the Father). This is how He had the fullness of God and that same fullness have we all received (through the Seed that contains HaShem).
No man comes to the Father except the Father call him. The call comes through the Seed, who said He only speaks what He hears His Father speak.
Christ was not His name, it was the Greek form of His title.
For this reason, you can see that He HAD to arise, as a Seed that fell to the ground and brought forth much fruit. The Seed of the Father is not "sterile". This is why the Word cannot return void. The Word IS the Seed.
Now hear Genesis 1 this way: in the beginning was the Seed, and the Seed was with God, and the Seed was God.......and then.....Yeshua was the Seed made flesh (man).
And then.....when you've seen ME (the Seed that is Spirit), you've seen the Father. Why? Because all seeds bear fruit after their own kind and his kind is the Father.
In the same way that a son's seed carries the DNA of his father, so too did the Seed carry His Father. He said, I am in the Father (as Seed) and the Father is in me (reconciling all men unto Him). How are we reconciled? By taking on His image that the Seed produces in us.
This is why we must decrease so that He can increase, and of the increase of His kingdom there will be no end, until mortality is swallowed up of life just like a natural seed swallows up all the corruption around that it needs to grow into a mature plant.
And this is why He who has begun a good work in you shall finish it. A seed doesn't stop growing until it reaches the image of the original seed at maturity and neither will we.