In an illuminating exchange, Charles Hirschkind and Alireza Doostdar debate the compulsory quality of modern scientific reasoning. Doostdar, in The Iranian Metaphysicals, emphasizes the agency of Iran’s “metaphysical” practitioners. Modern science, on this view, has opened the doors of knowledge production to social classes outside the old scholarly elite. As new “possibilities for reasoning become available,” Doostdar shows, a motley cast of healers, Spiritualists, and occultists appropriate them for their own, frequently heterodox, ends. Hirschkind, however, worries that this analysis is too optimistic: it presumes that the modern subject apprehends science through a free market of ideas. In fact, certain manners of thought are so basic to our everyday functioning that to say we choose them is to overstate our self-awareness, let alone our free will. “Scientific rationalism is not simply an epistemological possibility,” Hirschkind writes, “but an ontological condition.”