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He collaborated in the publication of the Roman Catechism, presided over the Commissions for the reform of Roman Breviary and Roman Missal, and directed the work of the new edition of the Roman Martyrology.
Rector Potens, Verax Deus is the name of the daily hymn for Sext in the Roman Breviary.
No. 7 is assigned in the Roman Breviary to Monday at Lauds, from the Octave of the Epiphany to the first Sunday in Lent and from the Octave of Pentecost to Advent.
In April 2012, its much anticipated Latin-English Roman Breviary was published, having been granted an imprimatur by Bishop Fabian Bruskewitz.