Jameson submits two critiques of knowledge in the context of postmodernity. First, he claims that "[postmodern] theory seems necessarily imperfect or impure," since "no [self-coherent theories of the postmodern] have yet appeared"; indeed, this would require "an antifoundationalism that really eschews all foundations altogether, a nonessentialism without the last shred of an essence in it" (Introduction, xi-xii). In other words, slogans such as "no more meta-narratives" or "it's all about context" end up reinscribing the very metaphysical claims they set out to admonish.