God's love is wide, long, deep and high, which can only be comprehended through the revelation and knowledge of the Holy Spirit. Those who only have a superficial knowledge of God's love are like a person who looks at a one dimensional picture of the real thing.
In Ephesians 3:19, Paul prays for us to know the love of God which passes knowledge. The Greek word that is translated "know" in this verse is a verb expressing experiential knowledge. The Greek word that is translated "knowledge" is a noun denoting the act of knowledge. Paul is praying that we will experience the love of God which passes mere knowledge of it.
Since a true revelation of God's love makes us full with the fullness of God, then a lack of being full of God must mean that we lack understanding and experience of God's love. The end result of having understanding and experiential knowledge of God's love is that we will be filled with all the fullness of God.
