My son-in-law related to me the other night a conversation he had with an old friend of his from school. This friend is a pastor (which fact alone was enough to shock my SIL) and challenged everyone in the room by asking...which of you belongs to a church where there is no-one in need. He repeated this several times, making doubly sure everyone truly considered it seriously. There was not one person who could say that they belonged to a church where no-one was struggling, where no-one was in need of something. The pastor friend then looked at everyone, paused, and said, "I do". "My church has no-one in need. Not one person. When anyone is behind in rent, the church (that is all members contributing) pays the rent. When someone is short of food, everyone puts in to buy food...usually enough to last at least several weeks. If someone's car breaks down, and they cannot afford to pay for repairs, the church solves the problem. No-one is in need."
That is unity. That is love. But to get to that point, they need Jesus. They need to be totally honest with one another...transparent. Humble enough to admit to the troubles they are having. Trusting enough not to fear exclusion or condemnation. Just the the early church where they "had all things in common". The early church started off by "being in one accord in prayer and supplication". (Acts 1:14). There is the beginning to unity. Prayer. Intercessary prayer for one another, and for the lost. It begins by being one with Christ.