James Hitchcock

“The Council itself identified religious truth as present in what was in effect a series of overlapping circles, with all Christian faiths possessing some degree of truth but “the fullness of Christ’s truth” present only in the Catholic Church. The new ecumenism appeared revolutionary to many, a complete reversal of what had previously been taught. It was, however, merely a change of perspective, in that the Catholic Church had always recognized the core of orthodoxy in Protestantism (the Trinity, the divinity of Christ) but had previously emphasized its errors. Now she chose to recognize its truths, as the basis of imperfect brotherly unity. Eastern Orthodoxy Ecumenical priority was inevitably given to the Eastern Orthodox, who were recognized as sharing most of the Catholic faith. Separation from the Orthodox was viewed by the Council Fathers as a lamentable historical misfortune, and the mutual excommunications of 1054 were formally rescinded after the Council. Protestants The Council warned against a false ecumenism based on an indifference to, or a misinterpretation of, doctrine. However, under Bea’s direction, official dialogues were initiated, especially with Lutherans and Anglicans. In practical terms, the immediate effect of ecumenism was to alter Catholics’ and Protestants’ attitudes toward one another, as for the first time they were allowed, even encouraged, to pray together both formally and informally, although they could not share the Eucharist. The”
― James Hitchcock, History of the Catholic Church: From the Apostolic Age to the Third Millennium

“The new feast of Corpus Christi (“Body of Christ”), with processions winding through the streets, was established in the thirteenth century, and the practice of exposing the Blessed Sacrament in the monstrance (“showing”) a little later.”
― James Hitchcock, History of the Catholic Church: From the Apostolic Age to the Third Millennium