“Return,” said the Virgin, “and say that it is I, the Virgin Mary, the Mother of God, who sends thee.” ...She now commanded him to climb to the top of the barren rock of Tepeyac, to gather the roses which he should find there, and to bring them to her. The humble messenger obeyed, though well knowing, that on that spot were neither flowers nor any trace of vegetation. Nevertheless, he found the roses, which he gathered and brought to the Virgin Mary, who, throwing them into his tilma, said, “Return, show these to the bishop, and tell him that these are the credentials of thy mission.” Our Lady of Guadalupe to Juan Diego  (Quoted by Calderín de la Baxca in “LIFE IN MEXICO, DURING A RESIDENCE OF TWO YEARS” (1839-1841), LONDON: CHAPMAN AND HALL, 186, STRAND., pub. 1843, pg. 61)