How good and pleasant it is when brothers live together in unity! Psalm 133:1
How good and pleasant it is when brothers and sisters care about each other, not just about getting the job done or about doing what the boss wants.
How good and pleasant it is when you can express your concern that someone is being treated unfairly, and you are heard, even if you don't have all the right words to express it.
Unity is not when people agree on every detail -- that probably rarely happens. Unity is when colleagues trust each other enough to express what they really feel, and trust each other enough to listen to how the other feels, without being disappointed or threatened.