The new policy also prohibits the celebration of Traditional Latin Masses on the first Sunday of every month, Christmas, the Triduum, Easter Sunday, and Pentecost Sunday.
Set in motion by Pope Francis' Traditionis custodes, the Chicago Archdiocese's policy was issued Dec. 27 and first reported by Vatican News. Traditionis custodes is a July 16 motu proprio in which the pope placed sweeping restrictions on the celebration of Mass using the 1962 Roman Missal, known variously as the extraordinary form of the Roman Rite, the Tridentine Mass, and the Traditional Latin Mass. (You can read a further explanation of the document here.)
Chicago's new rules mirror those spelled out in an explanatory document regarding Pope Francis' edict published Dec. 18 by the Congregation for Divine Worship and the Discipline of the Sacraments, the Vatican office responsible for matters related to the sacred liturgy.
"My intention in sharing this policy is to encourage you to reflect on the duty we each must assist our people in this moment of Eucharistic revival by rediscovering the value of the liturgical reform in the rites given to us by the Second Vatican Council," Cupich wrote in an accompanying letter to priests, Vatican News reported.
The Vatican's explanatory document states that the intent of Traditionis custodes is "to re-establish in the whole Church of the Roman Rite a single and identical prayer expressing its unity, according to the liturgical books promulgated by the Popes Saint Paul VI and Saint John Paul II, in conformity with the decrees of the Second Vatican Council and in line with the tradition of the Church."
The explanatory document notes that Traditionis custodes stipulates that sacraments cannot be celebrated using the liturgical books Rituale Romanum and the Pontificale Romanum promulgated prior to the Vatican II reforms.