125 Since in the course of this year there is completed, as We mentioned above, the first hundred years since the Universal Church, by order of Our predecessor of happy memory, Pius IX, celebrated the feast of the Sacred Heart of Jesus, We earnestly desire, venerable brethren, that the memory of this centenary be everywhere observed by the faithful in the making of public acts of adoration, thanksgiving and expiation to the divine Heart of Jesus. And though all Christian peoples will be linked by the bonds of charity and prayer in common, ceremonies of Christian joy and piety will assuredly be carried out with a special religious fervor in that nation in which, according to the dispensation of the divine Will, a holy virgin pointed the way and was the untiring herald of that devotion.
Source: Haurietis Aquas (Vatican.va)