1 John 4:7-21Good News Translation (GNT)
God Is Love
7 Dear friends, let us love one another, because love comes from God. Whoever loves is a child of God and knows God. 8 Whoever does not love does not know God, for God is love. 9 And God showed his love for us by sending his only Son into the world, so that we might have life through him. 10 This is what love is: it is not that we have loved God, but that he loved us and sent his Son to be the means by which our sins are forgiven.
11 Dear friends, if this is how God loved us, then we should love one another. 12 No one has ever seen God, but if we love one another, God lives in union with us, and his love is made perfect in us.
13 We are sure that we live in union with God and that he lives in union with us, because he has given us his Spirit. 14 And we have seen and tell others that the Father sent his Son to be the Savior of the world. 15 If we declare that Jesus is the Son of God, we live in union with God and God lives in union with us. 16 And we ourselves know and believe the love which God has for us.
God is love, and those who live in love live in union with God and God lives in union with them. 17 Love is made perfect in us in order that we may have courage on the Judgment Day; and we will have it because our life in this world is the same as Christ's. 18 There is no fear in love; perfect love drives out all fear. So then, love has not been made perfect in anyone who is afraid, because fear has to do with punishment.
19 We love because God first loved us. 20 If we say we love God, but hate others, we are liars. For we cannot love God, whom we have not seen, if we do not love others, whom we have seen. 21 The command that Christ has given us is this: whoever loves God must love others also.
John 13:35
If you have love for one another, then everyone will know that you are my disciples.”
II Peter 1
3 God's divine power has given us everything we need to live a truly religious life through our knowledge of the one who called us to share in his own glory and goodness. 4 In this way he has given us the very great and precious gifts he promised, so that by means of these gifts you may escape from the destructive lust that is in the world, and may come to share the divine nature. 5 For this very reason do your best to add goodness to your faith; to your goodness add knowledge; 6 to your knowledge add self-control; to your self-control add endurance; to your endurance add godliness; 7 to your godliness add Christian affection; and to your Christian affection add love. 8 These are the qualities you need, and if you have them in abundance, they will make you active and effective in your knowledge of our Lord Jesus Christ. 9 But if you do not have them, you are so shortsighted that you cannot see and have forgotten that you have been purified from your past sins.
10 So then, my friends, try even harder to make God's call and his choice of you a permanent experience; if you do so, you will never abandon your faith. 11 In this way you will be given the full right to enter the eternal Kingdom of our Lord and Savior Jesus Christ.
Bottom line, if one has not Love, it is very likely they are not born again.