Pope Leo XIII
Dall'alto dell'Apostolico Seggio §15
Dall'alto dell'Apostolico Seggio
15 But this is not all. - As, in the social order, the war against religion is becoming most disastrous and destructive to Italy, so, in the political order, the enmity against the Holy See and the Roman Pontiff is for Italy a source of the greatest evils. Even as to this, demonstration is not needed; it is enough, for the full expression of our thought, to state in few words its conclusions. The war against the Pope is for Italy, internally, a cause of profound division between official Italy and the great part of Italians who are truly Catholic: and every division is a weakness. This war deprives our country of the support and co-operation of the party which is the most frankly conservative; it keeps up in the bosom of the nation a religious conflict which has never yet brought any public good, but ever bears within itself the fatal germs of evil and of most heavy chastisement. Externally, the conflict with the Holy See, besides depriving Italy of the prestige and splendour which it would most certainly have by living in peace with the Pontificate, draws upon it the hostility of the Catholics of the whole world, is a cause of immense sacrifices, and may on any occasion furnish its enemies with a weapon to be used against it.
Source: Dall'alto dell'Apostolico Seggio (Vatican.va)