Jesus says the command ‘You shall not murder’ must cause us to examine our hearts deeply whether we have fulfilled its spirit not only its letter. And so the command includes anger, contempt, arrogance and everything else that is not love towards a brother or sister. God’s will for us is to love our neighbor as we love ourselves, so we must always examine not only our acts and words, but our hearts. Are we one with Christ who humbled and emptied himself for sinners? Are we one with Christ who hated the sin and took it upon himself to destroy in order to save the sinner?
Apostle John says in 1 John 3:19-22 to test whether we belong to the truth and set our hearts at rest in God’s presence. If my heart condemns me, if I have not done all that is in my power to reconcile with a brother who has something against me, I can have no confidence to come to him and leave my gift on the altar. I must quickly go and make it right with my brother as far as it depends on me, knowing that God desires mercy not empty sacrifice, knowing that to obey is better than sacrifice. Only then I will know that I truly belong to him, and my life pleases him and glorifies him, because I live with the same heart towards my brother that Christ had towards me.