The prophet saith: Seven times a day have I given praise to thee.1 We shall observe this sacred number of seven, if we fulfil the duties of our service in the Hours of Lauds, Prime, Terce, Sext, None, Vespers and Compline; for it was of these day Hours that he said: Seven times a day have I given praise to thee.1 But of the Night Office the same prophet saith: I arose at midnight to give praise to thee.2 At these times, therefore, let us render praise to our Creator for the judgements of his justice: that is, at Lauds, Prime, Terce, Sext, None, Vespers and Compline; and let us rise in the night to praise him.
1Ps cxviii, 164
2Ibid 62