The Twelve Books on the Institutes of the Cœnobia, and the Remedies for the Eight Principal Faults

The nocturnal system of prayers and Psalms as observed throughout Egypt has been, I think, by God’s help, explained so far as our slender ability was able; and now we must speak of the services of Tierce, Sext, and None, according to the rule of the monasteries of Palestine and Mesopotamia, as we said in the Preface, and must moderate by the customs of these the perfection and inimitable rigour of the discipline of the Egyptians.