Love Your Neighbor as Yourself

And one of the scribes came and heard them arguing, and recognizing that He had answered them well, asked Him, "What commandment is the foremost of all?" Jesus answered, "The foremost is, 'Hear, O Israel! The Lord our God is one Lord; and you shall love the Lord your God with all your heart, and with all your soul, and with all your mind, and with all your strength.' "The second is this, 'You shall love your neighbor as yourself.' There is no other commandment greater than these." (NAS, Mark 12:28-31)

In Jesus' teachings, our relationship with our fellow men, women and children is inseparable from our relationship with God. Love of God and love of our neighbors are two aspects of the same calling:
"A new command I give you: Love one another. As I have loved you, so you must love one another. By this all men will know that you are my disciples, if you love one another." (NIV, John 13:34-35)