Basically, this prayer (below) by Paul is a request that the Ephesians might have wisdom to know what the Father has made the Lord Jesus Christ to be unto them: mainly, (1) that they might know the hope of His calling, (2) what are the riches of the glory of His inheritance in the saints, and (3) what is the exceeding greatness of His power toward them.
Here Paul is saying that Christ has called them to (or brought to them) a great hope, a hope which is in Himself. Hence, his prayer is that they might find this hope in Christ. Secondly, his prayer is that they might understand how rich and glorious their inheritance is, that is, what great things eternal life has brought them. I think the thought is that they are gloriously rich because they have gained Christ; their glorious riches are in Christ. Thirdly, Paul prayed that they might see that they are exceedingly powerful in Christ (that they have His power within them), and that it is the same power that raised Christ from the dead and seated Him at the Fathers right hand.
… [I] do not cease giving thanks for you, while making mention of you in my prayers; 17 that the God of our Lord Jesus Christ, the Father of glory, may give to you a spirit of wisdom and of revelation in the knowledge of Him. 18 I pray that the eyes of your heart may be enlightened, so that you may know what is the hope of His calling, what are the riches of the glory of His inheritance in the saints, 19 and what is the surpassing greatness of His power toward us who believe. These are in accordance with the working of the strength of His might 20 which He brought about in Christ, when He raised Him from the dead, and seated Him at His right hand in the heavenly places, 21 far above all rule and authority and power and dominion, and every name that is named, not only in this age, but also in the one to come. 22 And He put all things in subjection under His feet, and gave Him as head over all things to the church, 23 which is His body, the fulness of Him who fills all in all.