A very fine sermon Kaleo Church, based on John 13: 34-35 and John 17:23
John 13:34-35: "A new commandment I give to you, that you love one another: just as I have loved you, you also are to love one another. 35 By this all people will know that you are my disciples, if you have love for one another."
John 17:23: "I in them and you in me, that they may become perfectly one, so that the world may know that you sent me and loved them even as you loved me."
H/T to Fide-o