Originally published at The Catholic Thing

The motu proprio Summorum Pontificum (2007) of Pope Benedict XVI introduced into the contemporary ecclesial vocabulary a distinction that has since become both fruitful and contentious: the “Ordinary Form” and the “Extraordinary Form” of the one Roman Rite. Benedict was at pains to insist that these are not two rites but two usages of the same lex orandi. The Missal promulgated by Pope Paul VI after the Second Vatican Council constitutes the Ordinary Form; the Missal of Pope John XXIII (1962), standing in organic continuity with the Tridentine codification of Pope Pius V, may be celebrated as the Extraordinary Form.

Benedict’s claim was juridical and pastoral, but its deeper import is theological. The coexistence of the two forms within one rite can be understood as a “polar unity” in the sense articulated by Hans Urs von Balthasar: a living tension of complementary principles whose unity is not the flattening of difference but its orchestration.

Benedict himself rejected the hermeneutic of rupture that would pit preconciliar and postconciliar liturgy against one another. In his famous 2005 address to the Roman Curia, he contrasted a “hermeneutic of discontinuity and rupture” with a “hermeneutic of reform in continuity.”

The liturgy, precisely because it

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