19 We must look briefly at the two essential stages in the political realization of this hope, because they are of great importance for the development of Christian hope, for a proper understanding of it and of the reasons for its persistence. First there is the French Revolution—an attempt to establish the rule of reason and freedom as a political reality. To begin with, the Europe of the Enlightenment looked on with fascination at these events, but then, as they developed, had cause to reflect anew on reason and freedom. A good illustration of these two phases in the reception of events in France is found in two essays by Immanuel Kant in which he reflects on what had taken place. In 1792 he wrote Der Sieg des guten Prinzips über das böse und die Gründung eines Reiches Gottes auf Erden (“The Victory of the Good over the Evil Principle and the Founding of a Kingdom of God on Earth”). In this text he says the following: “The gradual transition of ecclesiastical faith to the exclusive sovereignty of pure religious faith is the coming of the Kingdom of God”. He also tells us that revolutions can accelerate this transition from ecclesiastical faith to rational faith. The “Kingdom of God” proclaimed by Jesus receives a new definition here and takes on a new mode of presence; a new “imminent expectation”, so to speak, comes into existence: the “Kingdom of God” arrives where “ecclesiastical faith” is vanquished and superseded by “religious faith”, that is to say, by simple rational faith. In 1794, in the text Das Ende aller Dinge (“The End of All Things”) a changed image appears. Now Kant considers the possibility that as well as the natural end of all things there may be another that is unnatural, a perverse end. He writes in this connection: “If Christianity should one day cease to be worthy of love ... then the prevailing mode in human thought would be rejection and opposition to it; and the Antichrist ... would begin his—albeit short—regime (presumably based on fear and self-interest); but then, because Christianity, though destined to be the world religion, would not in fact be favoured by destiny to become so, then, in a moral respect, this could lead to the (perverted) end of all things”.
Source: Spe Salvi (Vatican.va)