For in him dwelleth all the fulness of the Godhead bodily. And ye are complete in him, which is the head of all principality and power: Colossians 2:9-10 KJV
In Him you have completeness and authority.
If the fullness of the Godhead dwells in Him bodily and the church is His body, then the fullness is dwelling in the church. If the fullness is in Him and you are complete in Him then His fullness dwells in you. Every principality and power is therefore subject to you in Christ!
In other words; if verse 9 is true, then verse 10 is also true.