You left out this part: "And the second part is as great as the first: YOU SHALL LOVE YOUR NEIGHBOR AS I HAVE LOVED YOU."
Now, as we are not to love ourselves supremely, this is virtually a command, in the first place, not to love our neighbor with all our heart and soul and mind and strength. And thus it is a condemnation of the idolatry of the creature. Our supreme and uttermost affection is to be reserved for God. But as sincerely as ourselves we are to love all mankind, and with the same readiness to do and suffer for them as we should reasonably desire them to show to us. The golden rule (Mt 7:12) is here our best interpreter of the nature and extent of these claims. >/I>
Would you like to hear the Catholic exegesis?
God alone is worthy of being loved "with all one's heart, and with all one's soul, and with all one's mind" (Mt 22:37). He is the source of man's happiness. Jesus brings the question about morally good action back to its religious foundations, to the acknowledgment of God, who alone is goodness, fullness of life, the final end of human activity, and perfect happiness.