Greater love hath no man than this, that a man lay down his life for his friends.
A true disciple should have love as their nature. Their love should be as such that they are willing to die for another. People with this type of love do not fight with one another. The greatest example of human self-sacrifice was for another to die for their friends. The Lord Jesus is our example, as He laid down His life for all because of the love He has, for all.