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Mary_Henley
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Catholic Church History
Theological Humanism (1517-1648) IV. The Catholic Reformation (1521-85)
37. Liturgical Renaissance
IV
The Catholic Reformation
37. LITURGICAL RENAISSANCE
A. Liturgical Charges
(1) THE MISSAL
Great diversity of usage had developed during the Middle Ages when individual dioceses and religious orders followed their peculiar modifications of the basic Latin Rite. The Council of Trent “clearly distinguished between truth and error and declared the objective character of the Mass. . . . A special commission . . . took another course by establishing the wished-for uniform missal. . . . The new missal had, in round numbers, 150 days free of feasts, not counting octaves. This was achieved by retaining only those feasts which were kept in Rome itself up to the eleventh century. Of the countless feasts later introduced, especially under the influence of the Franciscans, only a small number were preserved, and a few of these of saints outside Italy. . . . Besides the memorial days of the four Latin Fathers who were alone acknowledged in the Middle Ages, those of the Greeks were also included This book was to be from then on the standard in every church and no changes were to be made therein. Only churches which could demonstrate a two-hundred years’ custom for their own usage, were permitted to retain that usage.”
Pope St. Pius V, in sanctioning a revised Missale Romanum by a bull of July 14, 1570, prescribed its use wherever the aforementioned custom had not been proved to the contrary. Dominicans conserved their Missal, while the Franciscans renounced their peculiar usage’s. With few exceptions, the new Missal was adopted by the majority of the regular and secular clergy. It made obligatory recitation of the Introibo and Confiteor at the beginning of Mass, and of the Placeat and St. John’s Gospel at the end, thus completing the evolution of the Mass to the twentieth century, although minor rubrical revisions have since been introduced. Pope Sixtus V by a decree of January, 1588, set up the Congregation of Rites to supervise the new changes, but in the view of some liturgists a period of liturgical rigidity ensued. Clement XIII (1758-69) prescribed the Preface of the Trinity for Sundays, and Leo XIII (18781903) ordered prayers to be said after Low Mass. From 1661 to 1897 there was a prohibition by the Index of translations of the Canon of the Mass into the vernacular, and in place of the Missal the “prayer-book” took its place in the hands of most of the literate laity, until the twentieth century."

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Theological Humanism (1517-1648) IV. The Catholic Reformation (1521-85)
37. Liturgical Renaissance
IV
The Catholic Reformation
37. LITURGICAL RENAISSANCE
A. Liturgical Charges
(1) THE MISSAL
Great diversity of usage had developed during the Middle Ages when individual dioceses and religious orders followed their peculiar modifications of the basic Latin Rite. The Council of Trent “clearly distinguished between truth and error and declared the objective character of the Mass. . . . A special commission . . . took another course by establishing the wished-for uniform missal. . . . The new missal had, in round numbers, 150 days free of feasts, not counting octaves. This was achieved by retaining only those feasts which were kept in Rome itself up to the eleventh century. Of the countless feasts later introduced, especially under the influence of the Franciscans, only a small number were preserved, and a few of these of saints outside Italy. . . . Besides the memorial days of the four Latin Fathers who were alone acknowledged in the Middle Ages, those of the Greeks were also included This book was to be from then on the standard in every church and no changes were to be made therein. Only churches which could demonstrate a two-hundred years’ custom for their own usage, were permitted to retain that usage.”
Pope St. Pius V, in sanctioning a revised Missale Romanum by a bull of July 14, 1570, prescribed its use wherever the aforementioned custom had not been proved to the contrary. Dominicans conserved their Missal, while the Franciscans renounced their peculiar usage’s. With few exceptions, the new Missal was adopted by the majority of the regular and secular clergy. It made obligatory recitation of the Introibo and Confiteor at the beginning of Mass, and of the Placeat and St. John’s Gospel at the end, thus completing the evolution of the Mass to the twentieth century, although minor rubrical revisions have since been introduced. Pope Sixtus V by a decree of January, 1588, set up the Congregation of Rites to supervise the new changes, but in the view of some liturgists a period of liturgical rigidity ensued. Clement XIII (1758-69) prescribed the Preface of the Trinity for Sundays, and Leo XIII (18781903) ordered prayers to be said after Low Mass. From 1661 to 1897 there was a prohibition by the Index of translations of the Canon of the Mass into the vernacular, and in place of the Missal the “prayer-book” took its place in the hands of most of the literate laity, until the twentieth century."
Bold type is my addition