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In the Roman Breviary it appears as the hymn Placare, Christe, servulis.
How highly the practical wisdom of Antoninus was esteemed even during his lifetime is attested by the surname "Antoninus consiliorum", Antoninus of good counsel, given to him in the Roman Breviary.
He can tell the meaning of every vestment and of every change in a pontifical high mass, and I think he knows half the Roman Breviary by heart, and all the Psalms! '