We were created to have relationships; a relationship with God and with one another. How we interact with others says a lot about our relationship with Christ.
19 We love each other because he loved us first. 20 If someone says, “I love God,” but hates a fellow believer, that person is a liar; for if we don’t love people we can see, how can we love God, whom we cannot see? 21 And he has given us this command: Those who love God must also love their fellow believers. (1 John 4:19-21, NLT)
If we truly love God, we will also show love to our brothers and sisters in Christ as we are all members of His body. It's impossible to love the Head, but hate the Body, or to love the Groom, but hate His bride. To love the brethren is to also love God.
And we are members of his body. (Ephesians 5:30, NLT)
And the King will say, ‘I tell you the truth, when you did it to one of the least of these my brothers and sisters, you were doing it to me!’ (Matthew 25:40, NLT)
Love is not a feeling and it's not just something we say, it is a choice. A choice to see others through the eyes of God and to treat them the way He would. It has nothing to do with the other person's behaviour, but is consistent just as God is, for He is love (1 John 4:8).
Dear children, let’s not merely say that we love each other; let us show the truth by our actions. (1 John 3:18, NLT)