O Trinity of Blessèd Light

O Trinity of blessèd light,
O Unity of princely might,
The fiery sun now goes his way;
Shed Thou within our hearts a 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.

Author: Ambrose of Milan

Year: 370

This is the English translation (by John Mason Neale) of the Latin hymn 'O Lux beata Trinitas' traditionally attributed to St. Ambrose (c. 340–397). Some modern scholarship questions the direct attribution to Ambrose, but it remains the most common and historic attribution.