3 The Church, rejoicing in this inestimable gift, can show forth a more ardent love of her divine Founder, and can, in a more generous and effective manner, respond to that invitation which St. John the Evangelist relates as having come from Christ Himself: "And on the last and great day of the festivity, Jesus stood and cried out, saying, 'If any man thirst, let him come to Me, and let him drink that believeth in Me. As the Scripture saith: Out of his heart there shall flow rivers of living waters.' Now this He said of the Spirit which they should receive who believed in Him."(3)
Source: Haurietis Aquas (Vatican.va)