In Jesus Christ dwells all the fullness of the Godhead bodily. This is speaking of the Godhead as to essence. Jesus is the completion and He is the fullness of the Godhead. The believer is complete in Him. We are complete in Him because of His sacrifice at Calvary. He is not head over just the church, but He is also over all those who oppose Him.
(Read Philippians 2:10-11)