29 The Church which, from the day of Pentecost, has been destined here below to a never-ending life, which went forth from the upper chamber into the world endowed with the gifts and inspirations of the Holy Spirit, what has been her mission during the last twenty centuries and in every country of the world if not, after the example of her Divine Founder, "to go about doing good"? ( Acts x, 38) Certainly this work of the Church should have gained for her the love of all men; unfortunately the very contrary has happend as her Divine Master Himself predicted ( Matt . x, 17, 25) would be the case. At times the bark of Peter, favored by the winds, goes happily forward; at other times it appears to be swallowed up by the waves and on the point of being lost. Has not this ship always aboard the Divine Pilot who knows when to calm the angry waves and the winds? And who is it but Christ Himself Who alone is all-powerful, who brings it about that every persecution which is launched against the faithful should react to the lasting benefit of the Church? As St. Hilary writes, "it is a prerogative of the Church that she is the vanquisher when she is persecuted, that she captures our intellects when her doctrines are questioned, that she conquers all at the very moment when she is abandoned by all." (St. Hilary of Poitiers De Trinitate , Bk. VII, No. 4)
Source: Iniquis Afflictisque (Vatican.va)