Whoever believes in me as the Scripture says, streams of living water will flow from within him. By this he meant the spirit whom those who believed in him were later to receive.
Water is the symbol of spiritual life.
In the beginning of creation God's Holy Spirit brooded upon the face of the primeval waters and God separated the waters above the firmament from the waters below the firmament. All life began in water as indeed all life does to this very day. Jesus is baptized in the waters of the Jordan and filled with the Holy Spirit goes into that wilderness to integrate the darkness of sin with the light of the Father's Glory in his extraordinary ministry of grace. Thirst for the living water has been an aspect and indeed is an aspect of all time pilgrimage. He walks upon water in Galilee and of course he changes water into wine at Cana.