 In 1935-1936 he taught cosmology and psychology in Verona and studies natural science at the University of Padova.In 1936-1937 Fabro continued his study of theology at the "Angelicum" and received a doctorate on October 28, 1937 with a dissertation on the metaphysical notion of participation according to Saint Thomas Aquinas entitled "La nozione metafisica di partecipazione secondo S. Tommaso d'Aquino".Fabro published this dissertation as a book in 1939 with "Vita e Pensiero" of Milano.