78 What is here written of the side of Christ, opened by the wound from the soldier, should also be said of the Heart which was certainly reached by the stab of the lance, since the soldier pierced it precisely to make certain that Jesus Christ crucified was really dead. Hence the wound of the most Sacred Heart of Jesus, now that He has completed His mortal life, remains through the course of the ages a striking image of that spontaneous charity by which God gave His only begotten Son for the redemption of men and by which Christ expressed such passionate love for us that He offered Himself as a bleeding victim on Calvary for our sake: "Christ loved us and delivered Himself for us, an oblation and a sacrifice to God for an odor of sweetness."(82)
Source: Haurietis Aquas (Vatican.va)