“May be able to comprehend with all saints what is the breadth, and length, and depth, and height;”
King James Version (KJV)
3:18 That being rooted and grounded - That is, deeply fixed and firmly established, in love. Ye may comprehend - So far as an human mind is capable. What is the breadth of the love of Christ - Embracing all mankind. And length - From everlasting to everlasting. And depth - Not to be fathomed by any creature. And height - Not to be reached by any enemy.
Eph 3:18 May be able to comprehend. Unless they were "rooted and grounded in love" (Eph 3:17) and the "love of God shed abroad" in their hearts (Ro 5:5), it would be impossible for them to comprehend the exceeding riches of the love of Christ. This is the climax of prayer, the point to which the other petitions tend. Indeed, from the beginning of the Epistle, he has been declaring what love Christ has shown for the Gentile world.