Pope Leo XIII on 1/1/1901

…the Apostolic Exhortation and the encyclical penned by Pope Leo XIII that recommended to Catholics a nine-day novena of prayer for the Holy Spirit as the world entered the twentieth century. As the New Year broke in 1901, Pope Leo XIII prayed the hymn of the Holy Spirit, thereby giving the Spirit greater visibility in the church. (The early twentieth century also saw the birth of the modern Pentecostal movement, which has for more than a century none witness to the person and work of the Holy Spirit throughout the world.)

Source: Cecil M. Robeck Jr.  -  From the foreword of Pentecost and Parousia by Fr. Peter Hocken - p. ix