First letter about the book called the Horologion

By the beck and the will of the one God, Who is unoriginate, uncreated, immortal, eternal, uncircumscribed, unapproachable, immeasurable, infinite, simple, uncompounded, immutable and invisible were formed all things visible and invisible, meaning beings both incorporeal and eathly; as the wise Judith said, Thou thoughtes, and all things stood before Thee. But, according to Saint Gregory the Theologian, since the movement of Self-contemplation alone could not satisfy Goodness, but Good must be poured out and go forth beyond Itself, to multiply the objects of Its beneficence, He first constituted the angelic and heavenly powers, that they might praise and glorify Him unceasingly; then He also created man, a single living being compounded out of two natures, a new angel, an observer of the visible creation and an initiate of that which is noetic, so that even as on high those heavenly beings with never-silent lips ever praise and glorify God at all times and never fall silent, man is connected with dust, and cannot compete with the angels; therefore, the holy Fathers have reckond appropriate times for him to praise and glorify God, seven times each day; as the Psalmist says, Seven times a day have I praised Thee for the judgements of Thy righteousnes.[Ps. 118:164] These times are: at the completion of the day, that is, at evening; at the beging of the night, which is called the after supper hour; int the middle of the night; at the end of the night, which is the morning, thogether with the first hour of the new day; and at the third, sixth, ninth hours of the day.