But if this is so, what is the value of all the more or less laborious, more or less ingenious enquiries into "perfect legislation" and the best of possible social organisations? None; literally none! They can but bear witness to the lack of scientific education in those who pursue them. Their day is gone for ever. With this old point of view of human nature must disappear the Utopias of every shade and colour. The great revolutionary party of our day, the International Social-Democracy, is based not upon some "new conception" of human nature, nor upon any abstract principle, but upon a scientifically demonstrable economic necessity. And herein lies the real strength of this party, making it as invincible as the economic necessity itself. "The means of production and exchange on whose foundation the bourgeoisie built itself up, were generated in feudal society. At a certain stage in the development of these means of production and exchange, the conditions under which feudal society produced and exchanged, the feudal organisation of agriculture and manufacturing industry, in one word, the feudal relations of property become no longer compatible with the already developed productive forces, they become so many fetters. They had to be burst asunder; they were burst asunder. Into their place stepped free competition, accompanied by a social and political constitution adapted to it, and by the economical and political sway of the bourgeois class. A similar movement is going on before our own eyes. Modern bourgeois society, with its relations of production, of exchange, and of property, a society that has conjured up such gigantic means of production and of exchange, is like the sorcerer, who is no longer able to control the powers of the nether world whom he has called up by his spells. For many a decade past the history of industry and commerce is but the history of the revolt of modern productive forces against the property relations that are the conditions for the existence of the bourgeoisie and its rule. It is enough to mention the commercial crises that by their periodical return put on its trial, each time more threateningly, the existence of the entire bourgeois society.... The weapons with which the bourgeoisie felled feudalism to the ground are now turned against the bourgeoisie itself."[4]