Father Eustáquio was parish priest in Poá, in the metropolitan region of São Paulo, from 1935 to 1941 at the Nossa Senhora de Lourdes parish. Like Jesus the Good Shepherd, he dedicated his life to his parishioners: a special affection for the sick and suffering. There he built a grotto in honor of Our Lady of Lourdes and made available holy water mixed with water he himself had brought from France on his pilgrimage to Lourdes during his vacation in Holland in 1935. After the water ran out, he himself would give the blessings. From then on, accounts of miracles and many graces received began to emerge.