God has loved us and done all that He can to raise us up to be His healthy, happy, and mature children.  There is nothing we can really offer Him in return: He doesn't need glory and He already has anything that we could give to Him, but He does want us to love our brothers and sisters living right next to us, imitating His own love.

When we do that we show that we are truly our Father's children.  We give without asking whether our sister or brother is worthy or not, we love without judging whether our gift is fully appreciated, and we remain faithful to them without counting the cost.  Or at least we try as hard as we can to do so.  It is only in this way that we can appreciate God's own love for us and grow to its full measure, only thus that we can fully accompany Jesus in his own saving and seemingly often thankless mission.  And it is the only way that we can really give God the thanks and glory that he deserves for all of His love for us.

God is love, and the one who abides in God abides in love, and God in him.