Germany is the primary source of Socialist thought. Marx, Engels, Kant, Hegel...while there are others who defined the essential philosophy, Like Prudhomme, Rousseu and Plekhanov and Lenin, there is no question that Germany is the fount of Socialist ideas. As far back as 1881, Bismark was referring to Staatssocializmus, State Socialism. Marx of course laid out the "scientific" basis of the philosophy and the pamphlet writers went from there.
The word Socialism is derived from the latin Sociare, which means to share.
So, to distill the Philosophy of Socialism to its kernel (and be shamed for a mixed metaphor): Community and Sharing. To each according to his ability, to each according to his needs. The workers owning the means of production, etc. All of the intellectual masturbation in boring treatises in German and Russian are all just variations of the same theme: How it will start, who will participate, what are the details, how it will work. But because it is "scientific" the final result will be the withering away of the state leading to the workers and peasants owning the land and means of production and sharing labor and the results of labor.
Is there anyone here who disputes the foregoing. I am not talking about economics yet.