Back to Ephesians, chapter 4 this time, we will see a similar phrasing that shows that it is more that He fills us rather than we fill Him.
So in this way it shows that we do not have the fullness of Christ. We start pretty much at empty and we need to be filled with the fullness of Christ until we get to the point where we are of His measure and stature.
So we start out where we need to get rid of a lot of our humanity and begin backfilling with the new man. And those things that we are putting on reflect true righteousness and holiness.
And He is working it in you and He is working it in me and He is working it in you and you and you and you and you. If you are in the Body, He is working all of those things to bring you to the measure of the stature of the fullness of Himself and therefore to be His bride. And live forever serving, giving, doing, working, creating, all those things that God does.
So why fear? You have the fullness of Christ, the divine nature within you by His Spirit. And hopefully you are growing in that divine nature by putting on the image of Jesus Christ with the goal of the measure of the stature of our great King and High Priest.