The dialectic... means recognizing, in the causal order, the fact that the material and physical conditions for the life of man and of society continuously determine and modify the way man thinks and feels. But it also means seeing, in the action of groups of men in similar material conditions, forces that influence the social situation and change it. This is the real meaning of Marx’s determinism. No apostle or enlightened individual, but only a “class party”, can in particular historical conditions discover, not in the mind, but in social reality, the laws of a future historical formation that will destroy the present one.