In the first reading from the final chapter of the Book of Revelation we are treated to a vision of God’s throne in heaven.
“An angel showed me the river of life-giving water, sparkling like crystal, flowing from the throne of God. . . . On either side of the river grew the tree of life.”
That is reminiscent of the scene in Chapter 47 of Ezekiel where we read: “I saw water flowing out from beneath the threshold of the temple. . . Along the banks of the river fruit trees of every kind shall grow.”
In both cases the water stands for God’s life in us. In the first reading, the one from Revelation, that life from God is the source of endless happiness in heaven. In the reading from Ezekiel the river stands for God’s grace that people on earth carry out with them from church, sharing it among all with whom the come in contact through their days.