Paul gave thanks by hearing of the faith of the Ephesians, which was their beliefs and trust, as well as their love demonstrated in their acts toward each other. This is why all are constituted saints, and not just a select few, and why Paul continued to give thanks for those truly rooted (vv. 15-16). Verse 17 might be better understood if we understand what Paul meant by ‘glory’, the same glory-presence that blinded him on the road to Damascus, of the Lord at the right hand of the Father (Ps. 110). Then we have the work of the Spirit, sent to give us wisdom and the revelation of the Son, in the knowledge of him. Not strictly intellectual propositions, though it starts here, but has as its goal that we should know “the hope of His calling.”
An enlightened understanding also is of “the riches of the glory of His inheritance in the saints.” (vv. 17-18) We also come to know “the greatness of his power,” not only in believing, but in living out these beliefs in word and deed (v. 19). It is the same power that raised Jesus from the dead, and to remind us again, “seated Him at His right hand in the heavenly places, far above all principality and power and might and dominion, and every name that is named, not only in this age, but also in that which is to come.” (vv. 20-21) That age was ‘the last days’ of the old covenant age, and the age to come, post 70 AD, would be the full inauguration of the new covenant age.
He did not just put some things under the Son’s feet, such as in the heretical view of the Roman Catholic Church and others, who equate His kingdom solely with the individual heart, or the church, or both. Rather, “He put all things under His feet.” (v. 22a) As Kuiper is purported to have been the first to put it – there is no inch of anything in this world that is not under His Lordship. Of course, this includes the church, wherein He is the head, as groom to bride, “which is his body, the fullness of Him who fills all in all.” (v. 22bc). There is a real sense in which the fullness of Christ only comes for those who are in the body, the church, His bride. We may stand before him alone, but those in Him are never alone, we are all a part of the body.