Seven times a day do I praise you because of your righteous judgments.
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Augustine of Hippo
162. Such was, assuredly, the conduct of the Psalmist, who saith, "Seven times a day do I praise Thee, because of Thy righteous judgments" (ver. 164). The words "seven times a day," signify "evermore." For this number is wont to be a symbol of universality; because after six days of the divine work of creation, a seventh of rest was added;? and all times roll on through a revolving cycle of seven days. For no other reason it was said, "a just man falleth seven times, and riseth up again:" that is, the just man perisheth not, though brought low in every way, yet not induced to transgress, otherwise he will not be just. For the words, "falleth seven times," are employed to express every kind of tribulation, whereby man is cast down in the sight of men: and the words, "riseth up again," signify that he profiteth from all these tribulations. The following sentence in this passage sufficiently illustrates the foregoing words: for it follows, "but the wicked shall fall into mischief." Not to...
Seven. Often, (Worthington) as the word signifies, Proverbs xxiv. 16., &. (Vatable)
Yet here it may determine the precise number, as the Church seems to have taken it, by instituting the seven canonical hours of the day, and matins and lauds for the night, in imitation of the psalmist. (Berthier; ver. 147)
R. Solomon understands it literally, prescribing prayer twice before the reading of the decalogue, and once after in the morning; and in the afternoon, twice before and after the same lecture. The Church has enjoined matins to be said at night, lauds in the morning, prime, tierce, sext, none, vespers and complin, in the course of the day. (St. Benedict, reg. 8., and 16.) (Calmet)
This ecclesiastical office consists of hymns, psalms (St. Isidore)
Against it some have risen up, particularly against that part which was said in the night, pretending that God had made the night for rest; and hence they were called nuctazontes, or "drowsy "heretics. (St. Isidore, Of. i. 22.)