John 13:34, 35 "A new command I give you: Love one another. As I have loved you, so you must love one another. By this everyone will know that you are my disciples, if you love one another."
"Love is in the air" of the kingdom of God. Love is the air. Even as we are loved by God, we are to receive that love from Him and then give it to others. It is like breathing, in and out, continually. 1 John 4 speaks of it even further: Dear friends, let us love one another, for love comes from God. Everyone who loves has been born of God and knows God. Whoever does not love does not know God, because God is love. . . We love because he first loved us. Whoever claims to love God yet hates a brother or sister is a liar. For whoever does not love their brother and sister, whom they have seen, cannot love God, whom they have not seen. And he has given us this command: Anyone who loves God must also love their brother and sister.
It works this way, I think, that the more we actually receive the love God gives us, the more we are able to share that love with others. When we are loved, we can then love. He loved us first and out of being loved, we can love. His Spirit in us enables us to love. Our love is limited; His love is unlimited. Why He even tells us to love our enemies. "You have heard that it was said, 'Love your neighbor and hate your enemy.' But I tell you, love your enemies and pray for those who persecute you, that you may be children of your Father in heaven. He causes his sun to rise on the evil and the good, and sends rain on the righteous and the unrighteous. If you love those who love you, what reward will you get? Are not even the tax collectors doing that? And if you greet only your own people, what are you doing more than others? Do not even pagans do that? Be perfect, therefore, as your heavenly Father is perfect (Matthew 5:43-48). (Perfect means mature.) Maybe it will spur us on to love others if we separate them from their sin; we love people but hate their sin. And maybe it will spur us on to love others if we imagine the difference in each person's life when they do receive the love of God and are affected by it. Transformation!!! We actually love others because God love us first, not because they are necessarily worthy of our love. We were not worthy of the love God gives to us, yet He freely gives. His love transforms all of us who receive it.
Jesus calls us to remain in His love. "As the Father has loved me, so have I loved you. Now remain in my love. If you keep my commands, you will remain in my love, just as I have kept my Father's commands and remain in his love. I have told you this so that my joy may be in you and that your joy may be complete. My command is this: Love each other as I have loved you (John 15:9-12). Let no debt remain outstanding, except the continuing debt to love one another, for whoever loves others has fulfilled the law. The commandments, "You shall not commit adultery," "You shall not murder," "You shall not steal," "You shall not covet," and whatever other command there may be, are summed up in this one command: "Love your neighbor as yourself." Love does no harm to a neighbor. Therefore love is the fulfillment of the law (Romans 13:8-10).
Love brings unity, even amid diversity. And Jesus prays this prayer for us: "I pray for those who will believe in me through their message, that all of them may be one, Father, just as you are in me and I am in you. May they also be in us so that the world may believe that you have sent me. I have given them the glory that you gave me, that they may be one as we are one--I in them and you in me--so that they may be brought to complete unity. Then the world will know that you sent me and have loved them even as you have loved me (John 17:20-23)." Let us pray with Him. Lord knows we certainly could use a little unity in our world, not just for the sake of unity, but unified in what is good and true and real.