Ephesians 3:14 For this cause I bow my knees unto the Father of our Lord Jesus Christ, Eph 3:16 That he would grant you . . . That Christ may dwell in your hearts by faith;Eph 3:18 (That ye) May be able to comprehend with all saints what is the breadth, and length, and depth, and height;
The apostle Paul spent 3 years working with the church at Ephesus. Acts 20:31 Now, as he writes to them, he clearly lays out why he felt so deeply and earnestly for them and the extent of his prayer for them. He is now looking to their journey ahead and what is yet needed.
First, he prays for them to be strengthened. This strengthening was to be with might, that is, not just stronger, but to be the strongest they can be. Strength come by exercise and sweat and by overcoming greater and greater trials. This strengthening was to be with might, that is to the extreme; by His Spirit, that is supernaturally and finally, in the inner man, not physical strength but strength of character and will.
Secondly, that Christ may dwell in your hearts by faith. The term dwell has the idea of permanence and regularity. It is not a mountain top high, but rather a constant dependence on Him. The only way for that to happen is by faith in Him. We should not expect feelings, sensations, etc. but by a continual trust in Him that He will do by His power. It is not by seeing with our physical eyes but through the eyes of faith that we see the way.
Thirdly, he prays that they (you) may be able to comprehend what is the breadth, and length, and depth and height and to know the love of Christ which passeth knowledge and that ye might be filled with all the fullness of God. Wow! what a mouthful of wonder. Let’s break it down. The word comprehend can also be translated ‘apprehend’, and it means to take possession of or to know experientially. This is not head knowledge but knowledge that comes through experience. Literally, to know God as He is, the immensity of His height (all that is above), and depth (all that is below), and breadth (all that is past and future) and length (all peoples of all races and all authorities). All of this combined together and you will begin to grasp the Love of God and all He has planned for His Saints or believers. Literally, to be filled with the fullness of God.
Paul closes the chapter by concluding that God is able to do exceeding abundantly above all that we as or think, but it is according to the power that worketh in us, that God is glorified (seen) in the church. This is normal Christian living.