“Who blesses us with every spiritual blessing,among the celestials, in Christ”.

I begin this with much trepidation.
Because, in looking for celestials’ meaning, I find the answer is nebulous in the extreme. The celestials have ben explained as “above the heavens” and still another, “that part of the infinite universe, excepting the earth”..that takes in a lot of territory.  
In Hebrews, we read that it is that part of the universe that is on or higher than the heavens.
God the father resides somewhere in the celestials along with the Christ Jesus and any other entities that he has selected for company.
We will be there, the ecclesia, when ruled over by the Christ Jesus.
Following his turning over the rule of earth to the Father, He will ascend to take His place in the celestials, and we will follow.
Every time I think of the wondrous things to come, I remind myself that Paul is telling this, but he received the teachings from the Spirit of God.  Whenever Paul instructs on his own,such as mores, rules of conduct, he lets us know that it is coming from him and not the Spirit.
Along with the kingly multitude, in the celestials, there are the evil entities that roam, and one of our tasks will be to subdue them, and ultimately pacify the heavens, as will be done on earth..
How this is to be done will be made known.
Now “where” the celestials are to me.. its among the stars, somewhere in a galaxy far, far away.  
Paul may have visited the celestial kingdom, when he talks of sights he witnessed, whether in spirit or in person,  that he was unable to impart, and beyond describing, when he was taken into the heavens.
How will we be able to ascend into the heavens and then the celestials?
It won’t be in our present earthly form. Paul reminds us we will be transformed in an instant from mortal body to an immortal one. He even went so far as to state that the dead will change first and ascend, as though he believed it might be imminent, when he spoke of “those in repose”, which would exclude him. Little did he know of  the millennia that would pass before it occurs..paulnbob