One of the greatest truths of the Bible and one of the hardest to comprehend, is that we are the objects of God's love. God didn't just pity us or feel some sense of moral obligation to save us. He saved us because of His infinite love for us (John 3:16).To experience God's love is the key to being filled with all the fullness of God (Ephesians 3:19).
Paul prays in Ephesians 3:19, that we would experience the love of God which passes knowledge about it. How can we know the love of God if it passes knowledge? This sounds like a contradiction. It's not. The knowing is experiencing it. The end result of having understanding and knowledge of God's love is that we will be filled with all the fullness of God. God's love is the key that opens the door to everything that God is. God is love (1 John 4:8).
It's not just a casual acquaintance with God's love that we need, but an intimate understanding and knowledge of the depths of God's love. Just as a tree's roots provide stability and nourishment for the tree, so our revelation of God's love is the foundation upon which everything else we receive from God is built.