The retreats were crowned by sacramental confession and Communion. A large group of Saints, Blesseds, and Servants of God took part in retreats on the Caelian Hill. Among them: St. Julian Eymard, Saint Gaspare del Bufalo, St. Anthony Mary Gianelli, Saint Vincent Pallotti and Blessed Antonio Rosmini.
There were also Popes, such as the aforementioned Pius IX, and then Leo XIII, John XXIII, Paul VI, John Paul I.
From the late 19th century and throughout the 20th century the retreats were gradually assigned to various categories, priests, religious and lay faithful. After the Second Vatican Council, the Retreat House was also opened to Sisters, the laity and numerous parish groups.
Many ordination candidates of the various Roman colleges ascended the Caelian Hill for spiritual exercises in preparation for the various clerical orders. These include the aforementioned Saint John XXIII who transcribed his memories of his retreat in the unforgettable pages of his “Journal of a Soul”.
The retreat house of the Caelian Hill, which was recently renovated, is one of the oldest in the city. Since the arrival of the Passionists in 1773, it has always served those who want to spend time in an atmosphere of silence and recollection, a powerful experience of the Spirit according to the characteristic spirituality of the Congregation of the Passion.