Cholera had ravaged Marseilles for 111 days with a death toll of thousands.
God has been glorified in the public prayers we prescribed. The doctors were forecasting a frightful recurrence of the disease, and instead, as if to mock their predictions, God has sent it packing with a puff of wind; the epidemic came to a complete end with the novena of solemn adoration of the Blessed Sacrament. For me and all those with faith this is a clear miracle, more marvelous than that of the resurrection of a dead person. If the Holy Father is unaware of these things, you might speak of them, believe me you will not be guilty of exaggeration.
The two processions of the Blessed Sacrament, on the first and last days of the novena, each lasted five hours. My uncle, in light of his 85 years, left me to preside over the ceremonies. There were twelve thousand people, torches in hand, in the procession; and on the square, where the final benediction was given, more than eighty thousand people. You can just imagine the effect of so many voices during the “Tantum ergo,” in that huge church with the heavens as its cupola, and stretching as far as the eye could see; tears streamed down people’s faces. From that moment I knew we were being heard.
It is a fine compensation for my sufferings to see God glorified in this way, so many souls converted, and our town healed by these all-powerful means employed by infinite mercy.
Letter to Bishop Frezza in Rome, 27 April 1835, EO XV n 177