Pope John Paul II praised Juan Diego for his simple faith nourished by catechesis and pictured him (who said to the Blessed Virgin Mary: "I am a nobody, I am a small rope, a tiny ladder, the tail end, a leaf") as a model of humility for all of us.
Juan Diego, a native Mexican, was born in 1474 in Cuauhtitlan, which was established in 1168 by Nahua tribesmen and conquered by the Aztec lord Axayacatl in 1467; and was located 14 miles north of Tenochtitlan (Mexico City).
On December 9, 1531, Juan Diego rose before dawn to walk to daily Mass in what is now Mexico City. Juan lived a simple life as a weaver, farmer, and laborer. That morning, as Juan passed Tepeyac Hill, he heard music and a woman's voice called him to the top of the hill. There he saw a beautiful young woman dressed like an Aztec princess. She said she was the Virgin Mary and asked Juan to tell the bishop to build a church on that site. (...)
The bishop was kind but skeptical. He asked Juan to bring proof of the Lady's identity. Before Juan could go back to the Lady, he found out his uncle was dying. Hurrying to get a priest, Juan missed his meeting with the Lady. The Lady, however, met him on his path and told him that his uncle had been cured.
She then told Juan to climb to the top of the hill where they first met. Juan was shocked to find flowers growing in the frozen soil. He gathered them in his tilma (cloak) and took them at once to the bishop.
Juan told the bishop what had happened and opened his tilma. The flowers that fell to the ground were Castilian roses (which were not grown in Mexico). But the bishop's eyes were on the glowing image of the Lady imprinted inside Juan's tilma (or cloak).
Soon after, a church was built on the site where Our Lady appeared, and thousands of Native Mexicans converted to Christianity. Juan Diego died on May 30, 1548, at the age of 74.