"[1] Fredrich Engels, who developed it alongside Karl Marx, described: To accomplish this act of universal emancipation [proletarian revolution and communism] is the historical mission of the modern proletariat.
And just as the right of force and the right of artifice retreat before the steady advance of justice, and must finally be extinguished in equality, so the sovereignty of the will yields to the sovereignty of the reason, and must at last be lost in scientific socialism.In the 1844 book The Holy Family, Karl Marx and Friedrich Engels described the writings of the socialist, communist writers Théodore Dézamy and Jules Gay as truly "scientific".
[5] Scientific socialists view social and political developments as being largely determined by economic conditions, in contrast to the ideas of Utopian socialists and classical liberals, and thus believe that social relations and notions of morality are context-based relative to their specific stage of economic development.
[1] In his collection of texts, In Defence of Marxism, Leon Trotsky defended the dialectical method of scientific socialism during the factional schisms within the American Trotskyist movement during 1939-40.
Specifically, he described scientific socialism as the "conscious expression of the unconscious historical process; namely, the instinctive and elemental drive of the proletariat to reconstruct society on communist beginnings".