Trinity Sunday

O Trinity of blessed light,
O Unity of princely might,
the fiery sun now goes his way;
shed thou within our hearts thy ray.

To thee our morning song of praise,
to thee our evening prayer we raise;
O grant us with thy saints on high
to praise thee through eternity.

All laud to God the Father be;
all praise, eternal Son, to thee;
all glory, as is ever meet,
to God the holy Paraclete.

St. Ambrose of Milan (English translation: John Mason Neale, 1851)