Purists think that changes in our practical interests can’t affect what we know unless those changes are truth-relevant with respect to the propositions in question. Impurists disagree. They think changes in our practical interests can affect what we know even if those changes aren’t truth-relevant with respect to the propositions in question. I argue that impurists are right, but for the wrong reasons, since they haven’t appreciated the best argument for their own view. Together with “Minimalism and the Limits of Warranted Assertability Maneuvers,” “The Pragmatic Encroachment Debate,” and “Anti-Intellectualism” (below), this paper constitutes my attempt to refute the entire pragmatic encroachment debate. As I show in this paper, there is an argument for impurism sitting in plain sight that is considerably more plausible than any extant argument for pragmatism.