David Harvey said this quote

...those thoroughly incorporated within the inexorable logic of the market and its demands find that there is little time and space in which to explore emancipatory potentialities outside what is marketed as 'creative' adventure, leisure, and spectacle. Obliged to live as appendages of the market and of capital accumulation rather than as expressive beings, the realm of freedom shrinks before the awful logic and the hollow intensity of market involvements

~ David Harvey

Empiricism assumes that objects can be understood independendy of observing subjects. Truth is therefore assumed to lie in a world external to the observer whose job is to record and faithfully reflect the attributes of objects. This logical empiricism is a pragmatic version of that scientific method which goes under the name of 'logical positivism', and is founded in a particular and very strict view of language and meaning.

~ David Harvey

One of the curious things about our educational system, I would note, is that the better trained you are in a discipline, the less used to dialectical method you're likely to be. In fact, young children are very dialectical; they see everything in motion, in contradictions and transformations. We have to put an immense effort into training kids out of being good dialecticians. Marx wants to recover the intuitive power of the dialectical method and put it to work in understanding how everything is in process, everything is in motion. He doesn't simply talk about labor; he talks about the labor process. Capital is not a thing, but rather a process that exists only in motion. When circulation stops, value disappears and the whole system comes tumbling down.

~ David Harvey

This is what the bourgeois political economists have done: they have treated value as a fact of nature, not a social construction arising out of a particular mode of production. What Marx is interested in is a revolutionary transformation of society, and that means an overthrow of the capitalist value-form, the construction of an alternative value-structure, an alternative value-system that does not have the specific character of that achieved under capitalism. I cannot overemphasize this point, because the value theory in Marx is frequently interpreted as a universal norm with which we should comply. I have lost count of the number of times I have heard people complain that the problem with Marx is that he believes the only valid notion of value derives from labor inputs. It is not that at all; it is a historical social product. The problem, therefore, for socialist, communist, revolutionary, anarchist or whatever, is to find an alternative value-form that will work in terms of the social reproduction of society in a different image. By introducing the concept of fetishism, Marx shows how the naturalized value of classical political economy dictates a norm; we foreclose on revolutionary possibilities if we blindly follow that norm and replicate commodity fetishism. Our task is to question it.

~ David Harvey