Owen Barfield's terminology of Original and Final Participation represents an important distinction, whether by that name or some other.
Original Participation happens in early childhood (and early in human pre-history); reality is unconsciously and spontaneously apprehended; reality is obvious - it is 'out-there'. We see or hear, and we just-know what everything is and what it means.
In OP we are immersed-in reality, and just accept it as obvious, without thinking about it. We are in creation, directly in-contact; and we are swept-along by creation.
It was our unconsciousness and our lack of agency that made this immersion-in-reality possible.
In the stage of Consciousness Soul - now; we still suppose that reality is out-there, but we must consciously construct its meaning using logic, science... by abstraction and system-building. This, obviously, involves thinking - but that thinking is not a part of the abstraction and system building (unnoticed, ignored, denied).
So we are conscious of reality as a problem, and because conscious we are 'free', 'agents'; yet our consciousness of our-selves knows-itself to be cut-off from reality - because reality is out-there, and we are in-here.
In-here is experienced as real, yet out-there is supposedly the only reality...
We, in-here, can only make theories, have hypotheses, build 'models', about what is out-there - hence the ubiquity of alienation: we know we don't have direct access to reality.
In the end, nothing seems real - neither the self in-here, nor 'reality' out-there
Final Participation 'notices' that thinking is always and necessarily used in understanding reality; therefore reality is both in-here and out-there - reality is, in actuality, located in the process of thinking.
But not, obviously, in all kinds and instances of thinking... For example, the thinking of Consciousness Soul is not about reality (just theories, models, hypotheses); but the thinking of the Original Participation was about reality... however it was unconscious and passive and didn't know explicitly...
So... Final Participation is the same spontaneously apprehended reality as Original Participation - but conscious of itself.
And, being conscious of itself, it is an active participation; it participates in the creation of reality.
In other words, Final Participation is divine thinking.