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Ephesians 3:17-21 says, "That Christ may dwell in your hearts through faith; that you, being rooted and grounded in love,  may be able to comprehend with all the saints what is the width and length and depth and height—  to know the love of Christ which passes knowledge; that you may be filled with all the fullness of God.  Now to Him who is able to do exceedingly abundantly above all that we ask or think, according to the power that works in us,  to Him be glory in the church by Christ Jesus to all generations, forever and ever. Amen."
Paul's desire here was that Christ would dwell in their hearts. In order for this to be possible, faith is necessary. Faith is a complete trust in God and His will as seen in Hebrews 11. Yet Paul also desires that they be rooted and grounded in Love. If Christ is in our hearts through faith, won't we automatically be rooted and grounded in love. If we are not rooted and grounded in love, then Christ is not in our hearts.
When Christ is in our hearts (through faith, including proper love), only then will we begin to comprehend the width, length, depth, and height of the love of Christ. It is his desire that we know the love of Christ. This love that passes all knowledge (although we can comprehend it). Comprehending this love in us is the only way we can be filled with the fullness of God.
Then Paul reminds us who God is. God is able to do "exceedingly abundantly" above all that we ask or think. When we through faith submit to God, He will accomplish things in our lives for His purpose that are far beyond what we ask of Him and even far beyond what we think. This is done according to the power that works in us. That power which is there by faith and includes love. Therefore the limitation to what we can accomplish for good in Christ is only limited by our faith and love. When we let go of our small expectations and our own limited view of God and simply trust Him and through faith, follow Him, then His power will work in us to accomplish things we never even imagined.