Bogdánffy went to elementary school in Crna Bara, until 1925 when the Bogdánffy family moved to Timişoara a city in Eastern part of Banat. There he went to the Piarists high school. After his final exams, he was accepted to the Catholic seminary of the Latin-rite Diocese of Oradea. He was ordained a priest by the bishop of Oradea Stefan Fiedler on the June 29, 1934. He continued his studies at the University of Budapest, where he earned a PhD in philosophy and dogmatics (with a thesis on “Apocalyptics in the Synoptic Gospels”). Upon his return to Romania he became professor of the Catholic seminary in Oradea and confessor at the Ursuline convent in the city. In 1939 he was followed by the Royal Romanian Secret Services for alleged anti-Romanian activity. During World War II – because he was hiding Jews – he was also interrogated by the Hungarian Fascist „Nyílás” gendarmes.