2 It is indeed a wonderful and memorable event, whereby the enemies of the Church, in spite of themselves, whether they desire it or not, see with their own eyes that the Church maintains her divine life, and the virtue with which she is endowed from heaven; this indeed makes them feel that the impious strive in vain when they rage and plan foolish attacks against the Lord and against His Christ.
Source: Quod Anniversarius (Vatican.va)