Love ;
The message you heard from the very beginning is this; we must love one another. We must not be like Cain; he belonged to Evil One and murdered his own brother Abel.Why did Cain murder him? Because the things he himself did were wrong, and the things his brother did were right.
So do not be surprised if the people of the world hate you. We know that we have left death and come over into life; we know it because we love our brothers. Whoever doesn't love is still under the power of death. Whoever hates his brother is a murderer, and you know that a murderer doesn't have eternal life in him.This is how we know what love is: Christ gave his life for us. We too, then ought to give our lives for our brothers! If a rich person sees his brother in need, yet closes his heart against his brother, how can he claim that he loves God? Our love should not be just words and talk; it must be true love, which shows itself action.