Marxism is the fundamental theoretical acquisition of the proletarian struggle. It is on the basis of marxism that all the lessons of the proletarian struggle can be integrated into a coherent whole.
By explaining the unfolding of history through the development of the class struggle, that is to say struggle based on the defence of economic interests within a framework laid down by the development of the productive forces, and by recognising the proletariat as the subject of the revolution which will abolish capitalism, marxism is the only conception of the world which really expresses the viewpoint of that class. Thus, far from being an abstract speculation about the world, it is first and foremost a weapon of struggle for the working class. And because the working class is the first and only class whose emancipation necessarily entails the emancipation of the whole of humanity, a class whose domination over society will not lead to a new form of exploitation but to the abolition of all exploitation, only marxism is capable of grasping social reality in an objective and scientific manner, without any prejudices or mystifications of any sort.
Consequently, although it is not a fixed doctrine, but on the contrary undergoes constant elaboration in a direct and living relationship with the class struggle, and although it benefited from prior theoretical achievements of the working class, marxism has been from its very inception the only framework from which and within which revolutionary theory can develop.