O Lux Beata

O lux beata Trinitas,
et principalis Unitas,
as now the fiery sun departs,
shed Thou Thy beams within our hearts.

Te mane laudum carmine,
te deprecemur vespere:
te nostra supplex gloria
per cuncta laudet saecula.

Deo Patri sit gloria,
eiusque soli Filio,
cum Spiritu Paraclito,
et nunc, et in perpetuum.

O Trinity of blessed Light,
O Unity of sovereign might,
[as now the fiery sun departs,
shed Thou Thy beams within our hearts.]

To Thee our morning song of praise,
to Thee our evening prayer we raise;
Thee may our glory evermore
in lowly reverence adore.
 
All laud to God the Father be;
all praise, Eternal Son, to Thee;
all glory, as is ever meet,
to God the Holy Paraclete.

- Ascribed to St Ambrose of Milan (340-397)
- English text by J M Neale (1818-1866)