Genre: 
Full text: 
O lux beata trinitas et principalis unitas jam sol recedit igneus infunde lumen cordibus | Jam noctis tempus advenit quietem nobis tribue diluculo nos protege salvator unigenite | Te mane laudum carmine te praedicamus vespere te nostra supplex gloria per cuncta laudet saecula
Notes: 
cf. 008358.3 for the 1632 Urban VIII revision of this hymn, which begins differently and has extensive other differences