Liturgical use of Latin

[3] In response, the Catholic Church's Council of Trent, while not condemning vernacular liturgy in principle, discouraged its indiscriminate use and defended Latin's suitability for worship.

[3][4] After the council's conclusion, Pope Pius V codified and widely mandated the use of revised liturgical books of the Roman Rite that continued the tradition of Latin-only ritual.

In 1962, he released an encyclical entitled Veterum Sapientia in which he praised Latin for its impartiality, universality, immutability, formative value, historicity, and dignity as an elevated, non-vernacular language.

In 1964, the Sacred Congregation of Rites, in implementation of the constitution, authorized episcopal conferences to prepare liturgical books with vernacular translations of many parts of the Mass.

[13] In 1988, Pope John Paul II, in the apostolic letter Ecclesia Dei, permitted bishops to authorize the celebration of the pre-conciliar Latin Tridentine Mass for groups that requested it.

In 2007, Pope Benedict XVI promulgated the apostolic letter Summorum Pontificum which gave broad permission to use the pre-1970s reform Latin-language liturgical books.