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Priesthood

After finishing his studies at the seminary in Kraków, Wojtyła was ordained as a priest on All Saints' Day, 1 November 1946, by the Archbishop of Kraków, Cardinal Adam Stefan Sapieha. Sapieha sent Wojtyła to Rome's Pontifical International Athenaeum Angelicum, the future Pontifical University of Saint Thomas Aquinas, to study under the French Dominican friar Reginald Garrigou-Lagrange beginning on 26 November 1946. He resided in the Belgian Pontifical College during this time, under rectorship of Maximilien de Furstenberg. Wojtyła earned a licence in July 1947, passed his doctoral exam on 14 June 1948, and successfully defended his doctoral thesis titled Doctrina de fide apud S. Ioannem a Cruce (The Doctrine of Faith in St. John of the Cross) in philosophy on 19 June 1948. The Angelicum preserves the original copy of Wojtyła's typewritten thesis. Among other courses at the Angelicum, Wojtyła studied Hebrew with the Dutch Dominican Peter G. Duncker, author of the Compendium grammaticae linguae hebraicae biblicae.

According to Wojtyła's fellow student, the future Austrian cardinal Alfons Stickler, in 1947 during his sojourn at the Angelicum, Wojtyła visited Padre Pio, who heard his confession and told him that one day he would ascend to "the highest post in the Church". Stickler added that Wojtyła believed that the prophecy was fulfilled when he became a cardinal.

Wojtyła returned to Poland in the summer of 1948 for his first pastoral assignment in the village of Niegowić, 24 kilometres (15 miles) from Kraków, at the Church of the Assumption. He arrived at Niegowić at harvest time, where his first action was to kneel and kiss the ground. He repeated this gesture, which he adopted from John Vianney, throughout his papacy.

In March 1949, Wojtyła was transferred to the parish of Saint Florian in Kraków. He taught ethics at Jagiellonian University and subsequently at the Catholic University of Lublin. While teaching, he gathered a group of about 20 young people, who began to call themselves Rodzinka, the "little family". They met for prayer, philosophical discussion, and to help the blind and the sick. The group eventually grew to approximately 200 participants, and their activities expanded to include annual skiing and kayaking trips.

In 1953, Wojtyła's habilitation thesis was accepted by the Faculty of Theology at the Jagiellonian University. In 1954, he earned a Doctorate in Sacred Theology, writing a dissertation titled "Reevaluation of the possibility of founding a Catholic ethic on the ethical system of Max Scheler " (Polish: Ocena możliwości zbudowania etyki chrześcijańskiej przy założeniach systemu Maksa Schelera). Scheler was a German philosopher who founded a broad philosophical movement that emphasised the study of conscious experience. The Polish Communist authorities abolished the Faculty of Theology at the Jagiellonian University, thereby preventing him from receiving the degree until 1957. Wojtyła developed a theological approach, called phenomenological Thomism, that combined traditional Catholic Thomism with the ideas of personalism, a philosophical approach deriving from phenomenology, which was popular among Catholic intellectuals in Kraków during Wojtyła's intellectual development. He translated Scheler's Formalism and the Ethics of Substantive Values. In 1961, he coined "Thomistic Personalism" to describe Aquinas's philosophy.

During this period, Wojtyła wrote a series of articles in Kraków's Catholic newspaper, Tygodnik Powszechny (Universal Weekly), dealing with contemporary church issues. He focused on creating original literary work during his first dozen years as a priest. War, life in the Polish People's Republic, and his pastoral responsibilities all fed his poetry and plays. Wojtyła published his work under two pseudonyms, Andrzej Jawień and Stanisław Andrzej Gruda, to distinguish his literary from his religious writings (issued under his own name), and also so that his literary works would be considered on their own merits. In 1960, Wojtyła published the influential theological book Love and Responsibility, a defence of traditional church teachings on marriage from a new philosophical standpoint.

The aforementioned students regularly joined Wojtyła for hiking, skiing, bicycling, camping and kayaking, accompanied by prayer, outdoor Masses and theological discussions. In Stalinist-era Poland, it was not permitted for priests to travel with groups of students. Wojtyła asked his younger companions to call him "Wujek" (Polish for "Uncle") to prevent outsiders from deducing he was a priest. The nickname gained popularity among his followers. In 1958, when Wojtyła was named auxiliary bishop of Kraków, his acquaintances expressed concern that this would cause him to change. Wojtyła responded to his friends, "Wujek will remain Wujek," and he continued to live a simple life, shunning the trappings that came with his position as bishop. This beloved nickname stayed with Wojtyła for his entire life and continues to be affectionately used, particularly by the Polish people.