Victor Hugo,
Les Misérables — Volume 2, Book Sixth…
“ The Bernardines-Benedictines of Martin Verga, cloistered fifty years ago at Petit-Picpus, chant the offices to a solemn psalmody, a pure Gregorian chant, and always with full voice during the whole course of the office. Everywhere in the missal where an asterisk occurs they pause, and say in a low voice, "Jesus-Marie-Joseph." For the office of the dead they adopt a tone so low that the voices of women can hardly descend to such a depth. The effect produced is striking and tragic.The nuns of the Petit-Picpus had made a vault under their grand altar for the burial of their community. ”
