"That Christ may dwell in your hearts by faith; that ye, being rooted and grounded in love" (Ephesians 3:17)
God wants us to know how much He loves us. It's hard for us to imagine, the great Creator of the Universe wants us to know how much He loves us!
It's not about loving Him, for our revelation of His regard toward us is essential before everything else:
"We love because he first loved us." (1 John 4:19)
Now, how do we get the best foundation for knowing how much He loves us?
When we are established in His righteousness!
"In righteousness shalt thou be established: thou shalt be far from oppression; for thou shalt not fear: and from terror; for it shall not come near thee." (Isaiah 54:14)
When we know that we have been declared righteousness, that we are justified despite our failures and sins, we can know that God the Father accepts us fully. Love means nothing if you don't believe that you are accepted, too:
"Blessed is the man unto whom the LORD imputeth not iniquity, and in whose spirit there is no guile." (Psalm 32:2)
Paul declared to the Jews during his ministry:
"38Be it known unto you therefore, men and brethren, that through this man is preached unto you the forgiveness of sins: 39And by him all that believe are justified from all things, from which ye could not be justified by the law of Moses." (Acts 13:38-39)
Then you will have no problem being rooted in God's love for you.