Praised be Jesus and Mary!
Well, here are just some thoughts of mine.
First of all, there is probably nothing more important that can be said about this, than that it is a mystery. The humblest and simplest person can understand the mysteries of God oftentimes better than the learned (not that education should be a hindrance to understanding the mysteries of God, but only if it leads the person to think their reason is sufficient). I think the Incarnation has always struck everyone who learns about it it as extremely paradoxical on many levels, something which cannot be grasped by reason alone. Same with the Cross. Not that it is truly a logical paradox (that is, that it doesn’t make sense), but that there is nothing more difficult to understand than this, and all human attempts to explain it will hit a dead end somewhere or another. Almost everything we learn to be true, we know simply “is” long before we get an explanation as to how and why–so it would be expected that that is true of this mystery more than anything else.
That all being said, here are some things to consider.
First of all, that God became Man specifically, because man is that part of creation made in His image and likeness, corresponding to Him in a way that makes divinity and humanity compatible in one Person.
“And God created man to his own image…” (Gen 1:27).
God willed all creation in a single act, from all eternity, but man appeared last in the course of time as creation’s fulfillment. The creation of man was the fulfillment of the first creation, but there is a new creation which has its own process in time and fulfillment.
“And I saw a new heaven and a new earth. For the first heaven and the first earth was gone, and the sea is now no more. And I John saw the holy city, the new Jerusalem, coming down out of heaven from God, prepared as a bride adorned for her husband.” (Apoc 21:1-2)
River World Whole Red Shipping Top Island “If then any be in Christ a new creature, the old things are passed away, behold all things are made new. But all things are of God, who hath reconciled us to himself by Christ; and hath given to us the ministry of reconciliation.” (2 Cor 5:17-18).
Here is an indication that all creation was planned, from all eternity (that is “before” there was time or space, or anything created at all), such that it would be fulfilled by including God in it:
World Shipping River Red Whole Top Island “But when the fulness of the time was come, God sent his Son, made of a woman, made under the law: That he might redeem them who were under the law: that we might receive the adoption of sons.”