The Monastic Office uses the Hymn composed by St. Peter Damian,
N.B. Verses 1-5 & 6 are used for Vespers and Verses 6- 9 at Lauds. Not all versions have the same arrangement of verses. A variant text can also be found with a verse not found in the text above.
Other Hymns for St Gregory can be found in the Analecta Hymnica,
Splendido sacra gratulans amore