Moreover, although the apostle bids us to pray without ceasing, and although, to the saints, their very sleep is an orison, yet we ought to have fixed hours for prayer so that if, perchance, we are occupied with any business, the time, itself, may remind us of our duty. Everyone knows that the set times are the third, the sixth, and the ninth hours, at dawn and at evening. No food should be taken except after prayer and, before leaving the table, thanks should be rendered to our Creator. We should rise from our beds two or three times in the night and go over those passages of Scripture which we know by heart. Let prayer arm us when we leave our lodging. When we return from the streets, let us pray before we sit down nor give our miserable bodies rest until our souls are fed. In everything we do, in every step we take, let our hands trace the sign of the Lord’s cross.
From: “Letter XXII: To Eustochium” in Select Letters of Saint Jerome, translated from the Latin, and with an introduction and notes, by F. A. Wright; The Loeb Classical Library series (Cambridge: Harvard University Press, 1933), pp. 143, 145. The letter quoted from was written in AD 384.
Jerome (345-420) was an older contemporary of Augustine and a prolific author. He is best known today for having made the most-used translation of the Bible into Latin, the Vulgate. He lived in Bethlehem for the final 34 years of his life, where he built a monastery, of which he was the head.