We are to love God with our entire heart, our entire mind, our entire soul, and our entire strength and our neighbor as ourselves.
But what can we give God, aside from our receptivity so that he can fill us with his grace–his very life? Having received, God’s way of having us return the favor is to go and love our neighbor. This is why Jesus did not command, “Love one another as I love”, but instead, “Love one another as I have loved you”. It will require on our part allowing Jesus to love us in prayer, in the sacraments, in the scriptures, in his Church, and most of all in his Real Presence in the Eucharist.
If we do not allow ourselves to be pulled strongly and entirely into the orbit of the Trinity, we shall not be able to keep the two greatest commandments.
This is non-negotiable.