12 On that day We Ourself will go to St. Peter's Basilica, to the tomb of the Prince of the Apostles, to offer special prayers to the Virgin Mother of God, protector of Christians and mediator for peace. In this way heaven will be moved, in a sense, by the one voice of the Church resounding from all the continents on the earth. For as St. Augustine says, "Amid the various languages of men, the faith of the heart speaks one tongue." (12)
Source: Christi Matri (Vatican.va)