November 20, 2019 will mark the centenary of the promulgation of the Apostolic Letter Maximum Illud, with which Pope Benedict XV wished to give new impetus to the missionary call to proclaim the Gospel. On the occasion of this important anniversary, Pope Francis has called for the whole Church to observe an Extraordinary Missionary Month, entrusting leadership of this event to the Congregation for the Evangelization of Peoples and the Pontifical Mission Societies. This Guide , which is the result of a wide consultation with the local Churches, is intended to help you prepare and live the Extraordinary Missionary Month of October 2019. It is a gift made up of contribution from Christian all over the world.