O nox dulcis

Latin:
O nox dulcis, quies serena
Carmelitis sis longa, sis stabilis
No te turbet tristis Megaera
dum Mariae lux nitet amabilis

English:
Oh sweet night, may your serenity
remain long and steadfast for the Carmelites
Let not mournful Megera trouble you
while Mary's sweet light shines