The text of the hymn Caeli Deus Sanctissime is attributed to Pope St. Gregory the Great (540-604) and is sung at Vespers on Wednesdays. The chant below is performed by the monks of the Abbaye Sainte-Madeleine du Barroux.
Caeli Deus sanctissime,
qui lucidum centrum poli
candore pingis igneo
augens decori lumine.
Quarto die qui flammeam
solis rotam constituens,
lunae ministras ordini,
vagos recursus siderum,
Ut noctibus, vel lumini
diremptionis terminum,
primordiis et mensium
signum dares notissimum:
Illumina cor hominum,
absterge sordes mentium,
resolve culpae vinculum,
everte moles criminum.
Praesta, Pater piissime,
Patrique compar Unice,
cum Spiritu Paraclito
regnans per omne saeculum.
Amen.
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