Neither Marx nor Engels ever clearly defined the concept of class, and the last chapter of Volume III of Capital, which was to treat this question, breaks off after three or four paragraphs.
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Leszek Kolakowski (1978). Main Currents of Marxism, Vol I: The Founders, Oxford: Clarendon Press, p. 353Karl Marx
Marx claimed in Volume 1 [of Capital] that there was some interesting economics involved in a labor theory of value, and some believe his greatest fame in pure economics lies in his attempted analysis of "surplus value." Although he promised to clear up the contradiction between "price" and "value" in later volumes, neither he nor Engels ever made good this claim.
Karl Marx
In the sense used by Marx and Engels, the concept of ideology was intended to mean forms of social consciousness which prevent people from realising that their thinking about the world is determined by some conditions which do not depend on them and which are not themselves ingredients of consciousness. In ideological thinking, people imagine that the logic of thinking itself rules their consciousness and they are organically incapable of being aware of the social situations and of the interests which mould their mental work. This concept of ideology as false consciousness or as thinking that cannot be aware of its own sources may indeed be useful […] The defect of the concept, however, is that we never have criteria for stating that a certain theory or doctrine does not fall under the concept, even as far as natural science is concerned; nor may we ever be certain that a criticism of ideology is not itself ideological. No conceivable means are available for stating that Capital is not an ideology in this sense. Certainly, Marx maintained (not only in his famous letter to Ruge, but in The Poverty of Philosophy as well […]) that his own theoretical work was to express the real historical movement, i.e. that he was aware of the social sources of his own thinking and that he was in this sense himself free from ideology; however, there is no way of finding out beyond doubt that Marx or that anybody who conceives his own thinking as an "expression" of a certain historical process is not deluding himself about the meaning of his own self-consciousness.
Karl Marx
It is impossible to understand Marx's Capital, and especially its first chapter, without first having thoroughly studied and understood the whole of Hegel's Logic. Consequently, half a century later, none of the Marxists has understood Marx!
Karl Marx
All the sophisticated syllogisms of the ponderous volumes published by Marx, Engels, and hundreds of Marxian authors cannot conceal the fact that the only and ultimate source of Marx's prophecy is an alleged inspiration by virtue of which Marx claims to have guessed the plans of the mysterious powers determining the course of history. Like Hegel, Marx was a prophet communicating to the people the revelation that an inner voice had imparted to him.
Karl Marx
All of Marx’s major predictions have turned out to be wrong. He said that societies based on a market economy would suffer spiraling class polarization and the disappearance of the middle class. Every society lucky enough to enjoy the fruits of a market economy shows that Marx was wrong about that. He predicted the growing immiseration and impoverishment of the working class in capitalist societies. (Actually, he didn’t merely predict that it would happen, he predicted that it would happen necessarily and inevitably—thanks, Hegel!) The opposite has happened. Indeed, as Kolakowski notes, “in the second edition of Capital Marx updated various statistics and figures, but not those relating to workers’ wages; those figures, if updated, would have contradicted his theory.”
Karl Marx
Marx, Karl
Mary (mother of Jesus)
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