Matthew Poole and continuators on Ephesians 1:23

23 Which is his body , the fulness of him that filleth all in all .

i. e. A mystical one, whereof every Member is influenced by the Spirit of Christ the Head, as in the natural Body the Members are influenced by Spirits derived from the natural Head.

The Church is called the Fulness of Christ not Personally but Relatively considered, and as Head of the Church: The Head is incomplete without the Body; Christ in his Relative capacity as a Head would not be complete without his mystical Body the Church.

Lest Christ should be thought to have any need of the Church, because of her being said to be his Fulness, it is added, that she her self is filled by Christ. Christ fills all his Body, and all the Members of it with the Gifts and Graces of his Spirit, Chap. 4.10.

Marginal references: 1 Cor. 12.27. ch. 4.12. & 5.23, 30. Col. 1.18.; 1 Cor. 12.6. Col. 3.11.