Unity of hearts is challenging because it is where my uniqueness meets the uniqueness of the other. Often the uniqueness of the other is presented as a threat to me. Especially if I fail to see the good in the uniqueness of the other which will enrich me. And there is no real unity if I fail to see the uniqueness in the other. So, this is challenge. Only the Spirit of God who is the cause of our uniqueness can bring the real unity where you see the uniqueness of the other and welcome it as complementing your uniqueness. Realize the need of the Spirit of God in between persons and make sure the presence of the Spirit of God in between you and the other for a perfect unity. Creating unity is creating heaven for you and for the other.
Don Giorgio