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. Episcopate and cardinalate Call to the episcopate On 4 July 1958, while Wojtyła was on a kayaking holiday in the lakes region of northern Poland, Pope Pius XII appointed him as an auxiliary bishop of Kraków. He was consequently summoned to Warsaw to meet the Primate of Poland, Cardinal Stefan Wyszyński, who informed him of his appointment. Wojtyła accepted the appointment as auxiliary bishop to Kraków's Archbishop Eugeniusz Baziak, and he received episcopal consecration (as titular bishop of Ombi) on 28 September 1958, with Baziak as the principal consecrator and as co-consecrators Bishop Bolesław Kominek (titular bishop of Sophene), auxiliary of the Catholic Archdiocese of Wrocław, and Franciszek Jop, Auxiliary Bishop of Sandomierz (Titular Bishop of Daulia). Kominek was to become Cardinal Archbishop of Wrocław) and Jop was later Auxiliary Bishop of Wrocław and then Bishop of Opole). At the age of 38, Wojtyła became the youngest bishop in Poland. In 1959, Wojtyła began an annual tradition of saying a Midnight Mass on Christmas Day in