127 As a pledge of these favors with a full heart We impart to each one of you, venerable brethren, together with the clergy and faithful committed to your charge, to those in particular who by their devoted labors foster and promote the devotion to the Sacred Heart of Jesus, Our apostolic benediction. Given at Rome, at St. Peter's, the 15th of May, 1956, the eighteenth year of Our Pontificate.
Source: Haurietis Aquas (Vatican.va)