Eph 3:19 to know the love of Christ which passes knowledge; that you may be filled with all the fullness of God.
This prayer is to make believers wise unto salvation, and reveal the deep things of God to be pursued as new desires of the hearts.
Php 1:9-11, ”9 And this I pray, that your love may abound still more and more in knowledge and all discernment,.., 11 being filled with the fruits of righteousness which are by Jesus Christ, to the glory and praise of God.”
The focus here is the centrality of Christ in believers. God because of His love has laid up reachable spiritual blessings by prayer in His Son Jesus Christ. Therefore seeking spiritual wisdom and the revelation in the knowledge of Him will definitely shape our walk. When this is the case, we shall understand His love; and when we experience and know Christ’s love, we shall be as completely filled in our little measure as God is in His great measure.
In short, Paul wants us to know that Christ’s love exceeds far our knowledge of it.