2 And, Venerable Brethren, why should we not hope to-day after the lapse of half a century, when we renew the memory of the Immaculate Virgin, that an echo of that holy joy will be awakened in our minds, and that those magnificent scenes of a distant day, of faith and of love towards the august Mother of God, will be repeated? Of all this We are, indeed, rendered ardently desirous by the devotion, united with supreme gratitude for benefits received, which We have always cherished towards the Blessed Virgin; and We have a sure pledge of the fulfillment of Our desires in the fervor of all Catholics, ready and willing as they are to multiply their testimonies of love and reverence for the great Mother of God. But We must not omit to say that this desire of Ours is especially stimulated by a sort of secret instinct which leads Us to regard as not far distant the fulfillment of those great hopes to which, certainly not rashly, the solemn promulgation of the dogma of the Immaculate Conception opened the minds of Pius, Our predecessor, and of all the Bishops of the universe.
Source: Ad Diem Illum Laetissimum (Vatican.va)