6 This fact, however, is no reason to lose courage. The Church well knows that the gates of hell will not prevail against her. Furthermore, she knows that she will be sorely afflicted; that her apostles are sent as lambs among wolves; that her followers will always bear the brunt of hatred and contempt, just as her Divine Founder received hatred and contempt. So the Church advances unafraid, spreading the Kingdom of God wherever she preaches and studying every possible means she can use in regaining the losses in the kingdom already conquered. "To restore all things in Christ" has always been the Church's motto, and it is especially Our Own during these fearful moments through which we are now passing. "To restore all things" - not in any haphazard fashion, but "in Christ"; and the Apostle adds, "both those in the heavens and those on the earth." "To restore all things in Christ" includes not only what properly pertains to the divine mission of the Church, namely, leading souls to God, but also what We have already explained as flowing from that divine mission, namely, Christian civilization in each and every one of the elements composing it.
Source: Il Fermo Proposito (Vatican.va)