103 Saint Augustine opened the way to devotion to the Sacred Heart as the locus of our personal encounter with the Lord. For Augustine, Christ’s wounded side is not only the source of grace and the sacraments, but also the symbol of our intimate union with Christ, the setting of an encounter of love. There we find the source of the most precious wisdom of all, which is knowledge of him. In effect, Augustine writes that John, the beloved disciple, reclining on Jesus’ bosom at the Last Supper, drew near to the secret place of wisdom. Here we have no merely intellectual contemplation of an abstract theological truth. As Saint Jerome explains, a person capable of contemplation “does not delight in the beauty of that stream of water, but drinks of the living water flowing from the side of the Lord”.
Source: Dilexit Nos (Vatican.va)