Bonaventure reflects on the Sacred Heart of Jesus and the meaning of the blood and water flowing from the side of Christ crucified (John 19:34), the living water of sacramental grace coming from the loving heart of the Savior. He reflects especially on several lines of Psalm 36, used in the office of the feast : “Your love, Lord, reaches to heaven, your truth to the skies . . . In you is the source of life and in your light we see light.”