An angel showed me the river of life-giving water,
sparkling like crystal, flowing from the Throne of God and of the Lamb down the middle of the street....
The "street," in case you missed it, is in the New and Heavenly Jerusalem which has come down from heaven, beautiful as a bride adorned to meet her husband.
The life-giving water, coming from the Throne might be the Holy Spirit. And there you have another image of The Holy Trinity, a mystery infinitely more beautiful than that three-word expression.
But, since the Holy Spirit of the Scriptures seems to love irony, perhaps we should notice that most streams flowing through the streets of all ancient cities and many impoverished cities of today are anything but healthy. They would be sewers carrying the offal and filth of human beings and their animals. You have probably seen images of them in new clips, along with sad stories of suffocating poverty. During a downpour they might present some relief from the overbearing stench of communal life, but during the dry season people would rather not think about them.
Like the breath of the Risen Lord which is incredibly beautiful although it comes from a man who has been dead for 48 hours, this astonishing sewer gives life and healing. It is that same stream which flowed from his body when the soldier pierced his chest with a lance. It is Baptismal Water, our refreshment and delight, gathering everyone who drinks of it to the Heart of God.