Manna underwent philosophical studies at the Gregorian college in Rome from 1889 and in 1891 entered began his theological education in Milan.
In 1908 he became the editor of the magazine "Le Missioni Cattoliche" (the Catholic Missions) and in 1914 started publication of "Propaganda Missionaria" which became a popular broadsheet newspaper.
[4] This congregation spread at a rapid pace more so after Pope Benedict XV recommended its presence in all dioceses in "Maximum Illud" issued in 1919.
[1] The beatification process opened on 23 August 1973 under Pope Paul VI after the Congregation for the Causes of Saints issued the official "nihil obstat" to the cause and titled Manna as a Servant of God.
Cardinal Corrado Ursi inaugurated the cognitional process in Naples on 4 May 1973 and later oversaw its successful closure in 1976; theologians approved his spiritual writings on 15 February 1980 while the C.C.S.
on 10 January 1989 while Pope John Paul II confirmed the late priest's life of heroic virtue and titled him as Venerable on 18 February 1989.
sometime later; John Paul II approved the healing to be a miracle and beatified Manna in Saint Peter's Square on 4 November 2001.
His proposals regarding work in the missions anticipated the developments at the Second Vatican Council more so the declarations "Ad Gentes" 2: 39.