16 This mystic crown, then, not only is found in and glides through the hands of the poor, but it also is honored by citizens of every social rank. And We do not wish here to pass over in silence the fact that the Blessed Virgin herself, even in our times, has solicitously recommended this manner of prayer, when she appeared and taught it to the innocent girl in the Grotto of Lourdes.
Source: Ingravescentibus Malis (Vatican.va)