attr. Fra Angelico |
Oratio for Morning prayer (Ad laudes matutinas) on Saturday of the third week of the Psalter, Liturgia horarum, vols. 3 and 4 only. Liturgy of the hours:
"God our Father, fountain and source of our salvation, may we proclaim your glory every day of our lives, that we may sing your praise for ever in heaven."
The phrase "ut a tua numquam laude cessemus," at least, is ancient (Leonine, Gregorian, etc.).