He was baptized on June 20, 1920 in the parish church of Wadowice by Fr. Franciszek Zak, made his First Holy Communion at age 9 and was confirmed at 18. Upon graduation from Marcin Wadowita high school in Wadowice, he enrolled in Krakow's Jagiellonian University in 1938 and in a school for drama.
The Nazi occupation forces closed the university in 1939 and young Karol had to work in a quarry (1940-1944) and then in the Solvay chemical factory to earn his living and to avoid being deported to Germany.
In 1942, aware of his call to the priesthood, he began courses in the clandestine seminary of Krakow, run by Cardinal Adam Stefan Sapieha, archbishop of Krakow. At the same time, Karol Wojtyła was one of the pioneers of the "Rhapsodic Theatre," also clandestine.
After the Second World War, he continued his studies in the major seminary of Krakow, once it had re-opened, and in the faculty of theology of the Jagiellonian University. He was ordained to the priesthood by Archbishop Sapieha in Krakow on November 1, 1946.
Shortly afterwards, Cardinal Sapieha sent him to Rome where he worked under the guidance of the French Dominican, Garrigou-Lagrange. He finished his doctorate in theology in 1948 with a thesis on the subject of faith in the works of St. John of the Cross (Doctrina de fide apud Sanctum Ioannem a Cruce). At that time, during his vacations, he exercised his pastoral ministry among the Polish immigrants of France, Belgium and Holland.
In 1948 he returned to Poland and was vicar of various parishes in Krakow as well as chaplain to university students. This period lasted until 1951 when he again took up his studies in philosophy and theology. In 1953 he defended a thesis on "evaluation of the possibility of founding a Catholic ethic on the ethical system of Max Scheler" at Lublin Catholic University. Later he became professor of moral theology and social ethics in the major seminary of Krakow and in the Faculty of Theology of Lublin.