Deus, qui ad tuéndam cathólicam fidem beátum Petrum Confessórem tuum virtúte et doctrína roborásti: concéde propítius; ut ejus exémplis et mónitis errántes ad salútem resipíscant, et fidéles in veritátis confessióne persevérent.
O God, who didst give strength and learning to blessed Peter thy Confessor for the defense of the Catholic faith, mercifully grant, that by his example and teaching the erring may be saved and the faithful remain constant in the confession of truth.