20 The nineteenth century held fast to its faith in progress as the new form of human hope, and it continued to consider reason and freedom as the guiding stars to be followed along the path of hope. Nevertheless, the increasingly rapid advance of technical development and the industrialization connected with it soon gave rise to an entirely new social situation: there emerged a class of industrial workers and the so-called “industrial proletariat”, whose dreadful living conditions Friedrich Engels described alarmingly in 1845. For his readers, the conclusion is clear: this cannot continue; a change is necessary. Yet the change would shake up and overturn the entire structure of bourgeois society. After the bourgeois revolution of 1789, the time had come for a new, proletarian revolution: progress could not simply continue in small, linear steps. A revolutionary leap was needed. Karl Marx took up the rallying call, and applied his incisive language and intellect to the task of launching this major new and, as he thought, definitive step in history towards salvation—towards what Kant had described as the “Kingdom of God”. Once the truth of the hereafter had been rejected, it would then be a question of establishing the truth of the here and now. The critique of Heaven is transformed into the critique of earth, the critique of theology into the critique of politics. Progress towards the better, towards the definitively good world, no longer comes simply from science but from politics—from a scientifically conceived politics that recognizes the structure of history and society and thus points out the road towards revolution, towards all-encompassing change. With great precision, albeit with a certain onesided bias, Marx described the situation of his time, and with great analytical skill he spelled out the paths leading to revolution—and not only theoretically: by means of the Communist Party that came into being from the Communist Manifesto of 1848, he set it in motion. His promise, owing to the acuteness of his analysis and his clear indication of the means for radical change, was and still remains an endless source of fascination. Real revolution followed, in the most radical way in Russia.
Source: Spe Salvi (Vatican.va)