Ales diei nuntius (The Winged Herald of the Day)

(Found here)

The winged herald of the day
    Proclaims the morning bright;
Christ also, speaking in the soul,
    Wakes her to life and light.

“Take up your beds,” we hear Him say,
    “No more in slumber lie;
In justice, truth, and temperance,
    Keep watch;—your Lord is nigh.”

O Christ! and art Thou nigh indeed?—
    Then let us watch and weep;
This truth but once in earnest felt
    Forbids the heart to sleep.

Break, Lord, the spell that wraps us round
    In deadly bonds of night;
Shatter the chains of former guilt;
    Renew in us Thy light.

To God the Father glory be,
    And to His only Son;
The same, O Holy Ghost! to Thee,
    While ceaseless ages run.

~Aurelius Prudentius (348-413) – from Lyra Catholica