The great revelation of Fatima is that we must continually pray and sacrifice ourselves for the conversion of sinners. The essence of the message can be summed up in Our Lady’s declaration made during her fourth apparition on the 19th of August 1917 : « Many souls will fall into hell because they have no-one to sacrifice and pray for them. » From the Angel’s revelations in 1916 through to the apparitions of Our Lord or Our Lady to Sister Lucia in 1943, all the divine communications have as their principal objective to ask us to sacrifice ourselves and pray for the conversion of sinners. In return, Our Lady promises us peace in the world. Thus, the less sinners we have, the more likely we are to have peace.