Juan Diego took his faith very seriously and attended Mass on a daily basis. He had a fifteen mile walk to Mass every morning, and on December 9, 1531, when Juan Diego was on his way to morning Mass, the Blessed Mother appeared to him on Tepeyac Hill, the outskirts of what is now Mexico City. She asked him to go to the Bishop and to request that the bishop build a shrine be built at Tepeyac, where she promised to pour out her grace upon those who asked for her prayers. The Bishop at first didn’t believe Juan Diego, and he asked for some sign to prove that the apparition was true. On December 12, Juan Diego returned to Tepeyac. The Blessed Mother told him to climb the hill and to pick the flowers that he would find in bloom. He obeyed, and even though it was winter time, he found roses blooming. He gathered the flowers and took them to Our Lady who carefully placed them in his mantle and told him to take them to the Bishop as "proof". When he opened his mantle, the flowers fell on the ground and there remained impressed, in place of the flowers, an image of the Blessed Mother, the apparition at Tepeyac.
With the Bishop's permission, Juan Diego lived the rest of his life as a hermit in a small hut near the chapel where the miraculous image was placed for veneration. Here he cared for the church and the first pilgrims who came to ask for Mary’s intercession.
O God, who by means of Saint Juan Diego didst show the love of the most holy Virgin Mary for thy people: grant, through his intercession; that, by following the counsels our Mother gave at Guadalupe, we may be ever constant in fulfilling thy will; through Jesus Christ thy Son our Lord, who liveth and reigneth with thee, in the unity of the Holy Spirit, ever one God, world without end. Amen.