53 In particular, We refer to the numberless and diverse activities initiated for the education and development, as well as for the sanctification of both the clergy and laity, the organizations of clergy and laity formed to aid the missions in their manifold activities, both physical and moral, of the natural and the supernatural order, by the spreading far and wide of the Kingdom of Christ. We refer to the various organizations of young people which have helped to develop such ardent and true love for the Holy Eucharist and such tender devotion for the Blessed Virgin, virtues which have made certain their faith, their purity, and their union one with another: to the solemn celebrations in honor of the Blessed Sacrament, at which the Divine Prince of Peace is honored by truly royal triumphal processions, for about the Sacred Host, center of peace and love, gather multitudes from every country and the representatives of all peoples and nations, joined together in a union most wonderful by one and the same faith, in adoration, in prayer, and in the enjoyment of all heavenly graces.
Source: Ubi Arcano Dei Consilio (Vatican.va)