made an appearance at the canonization mass of Popes John XXIII and John Paul II, greeting the cardinals and Francis. In August 2014, Benedict celebrated Mass at the Vatican and met with his former doctoral students, an annual tradition he had kept since the 1970s. He attended the beatification of Pope Paul VI in October 2014. Weeks before this, he joined Francis in Saint Peter's Square for an audience with grandparents to honour their importance in society. Benedict wrote the text of a speech, delivered by Archbishop Georg Gänswein, on the occasion of the dedication of the Aula Magna at the Pontifical Urbaniana University to the pope emeritus, "a gesture of gratitude for what he has done for the Church as a conciliar expert, with his teaching as professor, as Prefect of the Congregation for the Doctrine of the Faith and, finally, the Magisterium." The ceremony took place on Tuesday, 21 October 2014, during the opening of the academic year. Benedict attended the consistory for new cardinals in February 2015, greeting Francis at the beginning of the celebration. In the summer of 2015, Benedict spent two weeks at Castel Gandolfo, at the invitation of Pope Francis. While at Castel Gandolfo, Benedict participated in two public events. He received two honorary doctorates given to him by Cardinal Stanislaw Dziwisz, Pope John Paul II's longtime aide, from the Pontifical University of John Paul II and the Kraków Academy of Music. In his reception address, Benedict paid homage to his predecessor, John Paul II. The Joseph Ratzinger–Benedict XVI Roman Library at the Pontifical Teutonic College was announced in April 2015 and was scheduled to open to scholars in November 2015. The library section dedicated to his life and thought is being catalogued. It includes books by or about him and his studies, many donated by Benedict himself. Benedict, in August 2015, submitted a handwritten card to act as a testimony to the cause of canonization of Pope John Paul I. In March 2016, Benedict gave an interview expressing his views on mercy and endorsing Francis's stress on mercy in his pastoral practice. Also that month, a Vatican spokesman stated that Benedict was "slowly, serenely fading" in his physical health, although his mental capacity remained "perfectly lucid". The pope emeritus was honoured by the Roman Curia and Francis in 2016 at a special audience, honouring the 65th anniversary of his ordination to the priesthood.