“We know that we have passed from death unto life, because we love the brethren. He that loveth not his brother abideth in death.” - 1 John 3:14.
Love is the key to achieving good neighbourliness. If we love one another, we will think and do good to each other. No one will want to hurt his neighbour and the world will be a much happier place. Jesus Christ made it clear during his days on earth that love is the greatest of all commandments, as it is written: “And one of the scribes came, and having heard them reasoning together, and perceiving that he had answered them well, asked him, Which is the first commandment of all? And Jesus answered him, The first of all the commandments is, Hear, O Israel; The Lord our God is one Lord: And thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this is the first commandment. And the second is like, namely this, Thou shalt love thy neighbour as thyself. There is none other commandment greater than these. And the scribe said unto him, Well, Master, thou hast said the truth: for there is one God; and there is none other but he: And to love him with all the heart, and with all the understanding, and with all the soul, and with all the strength, and to love his neighbour as himself, is more than all whole burnt offerings and sacrifices. And when Jesus saw that he answered discreetly, he said unto him, Thou art not far from the kingdom of God. And no man after that durst ask him any question.” –Mark 12:28-34.