 Fabro resumed his studies in philosophy and theology at the "Pontificium Institutum Internationale Angelicum", the future Pontifical University of Saint Thomas Aquinas, "Angelicum".On July 7, 1935 he obtained a licentiate in theology from the "Angelicum".For the period of summer-fall 1935 Fabro was on scholarship at the «Stazione Zoologica» of Naples.