Then Derrida starts (p. 85a) to wonder about how we can think and talk about systems and centers, without making a new system with a center. He mentions here Nietzsche, Freud, and Heidegger as all trying to do this, and failing to some extent because they all posited their own new systems (with centers). In other words, he says, you can't talk about any system without using the terms of that system: "We have no language--no syntax and no lexicon--which is foreign" to a system; "we can pronounce not a single destructive proposition which has not already had to slip into the form, the logic, and the implicit postulations of precisely what it seeks to contest.