Title: All his fullness
Cultists may not use this verse to point out that the “fullness” referred to here was given or bestowed by the Father God to the Lord Jesus at a given time, for that is not what the verse is saying.
The “fullness” in the Lord Jesus is the completeness of God’s being, meaning the totality of who God is. And here it is merely being affirmed as a fact that God’s fullness has always dwelt in the Lord Jesus and that the Father is pleased that it was so, and he was merely announcing it to all of creation. No act of giving and receiving can be construed from this verse, and no time element is involved either.