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| | Notes |
 | | Eventually, liturgical treatises such as the De ecclesiasticis officiis by Amalarius of Metz or the De divinis officiis by Rupert of Deutz will also have to be taken into account, as well as certain pre-Carolingian Roman documents such as the Ordines Romani or the decrees of Gregory the Great. |
 | | De quibus propheta ait: Qui ore benedicebant et corde suo maledicebant (Ps.61, 4)." Ceremoniae Sublacenses, CCM XI, 1, 30; "[I]d studii psallentes et orantes habeant, quatenus quod ore profertur, mente versetur"; Anselm of Havelberg (tIIS8), Liber de ordine canonicorum, PL 188, col. 1 107B. |
 | | Quod clerici, quantumlibet regulates, non poterunt observare: non etiam in ipsa sollemnitate sollemnitatum, scilicet per paschale festum, quando monachi servant consuetum in psalmis, responsoriis et lectionibus numerum, clerici propter catechumenos de consuetudo subtrahunt et in ipsa quoque missa rectius utili praedicationi quam prolixae cantioni operam dabunt. |
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