That He would grant you, according to the riches of His glory, to be strengthened with power through His Spirit in the inner man; 17 so that Christ may dwell in your hearts through faith; and that you, being rooted and grounded in love, 18 may be able to comprehend with all the saints what is the breadth and length and height and depth, 19 and to know the love of Christ which surpasses knowledge, that you may be filled up to all the fullness of God. NASB
Here Paul bows his knees to God (v. 14), being in great awe of His grace, by which He has given believers a new identity in Christ. He has given them a new spiritual life (Eph. 2:5) and has unified them—both Jews and Gentiles—together with Christ and made them sit with Him in heavenly places (Eph. 2:6). Hence, as Paul prays for the Ephesians, he is mindful of these things and that God is the Father of all believers.
His petitions for them are four fold: first, that God would strengthen them with power through His Spirit, so that they would have what it takes (the power) to trust Him and live pure and holy lives; second, that as they trust Christ He would dwell in their hearts—that He would feel at home within them; thirdly, that their roots would go down deep into God’s love and that they would feel and understand how good and great and full His love is, that is, that they would experience it for themselves; and fourth, consequently, that they would be filled up with God.
We see by Paul’s prayers, that he is a man with a great intellect and that he has acquired a remarkable love relationship with God. And so, by this observation, we must conclude that our prayers will be reflective of our relationship with God. Accordingly, if we want our prayers to be true we must endeavor to let them flow from our heart—so that our heart (our true self) is revealed.