By Dr. Jeff Mirus, Catholic Culture - The children who received the apparitions of Our Lady of Fatima saw a vision of huge numbers of people in hell, and heard from the Blessed Virgin Mary that the most common reason for this was sins of the flesh, sins against chastity and purity, sins against marriage. Nobody is required to accept private revelation, but the Church has repeatedly endorsed these particular apparitions, and this is partly because the words of Our Lady echo what we already know from Divine Revelation itself.