Jacques Derrida on the relevance of Marxism to postmodernism:
“deconstruction never had meaning or interest, at least in my eyes, than as a radicalization, that is to say, also *within the tradition* of a certain Marxism in a certain *spirit of Marxism*.”
For more on the implications of Derrida’s writings for postmodernism, see p. 14 of my Explaining Postmodernism: Skepticism from Rousseau to Foucault.
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“Any thinker who concludes that in principle reason cannot know reality is not fundamentally an advocate of reason.”
I would say that anyone — I wouldn’t say a thinker, because a thinker wouldn’t do that — who concludes that in principle reason can know reality — as the totality of everything — is not fundamentally an advocate of reason, but a theist who believes in platonic essences and scholastic-aristotelian species intelligibilis…