 In response to the skeptical argument, Averroes appeals to the fact of natural science: We do have (some) knowledge of the natural world. Furthermore, knowledge of the natural world just is knowledge of the natural causes of change (Averroes ITI: 318–19). Such knowledge must be derived, at least in part, from repeated observation of bodies. He also suggests that none of us sincerely doubts that this is so: he claims that his occasionalist opponent “denies with his tongue what is present in his mind” (Averroes ITI: 318). So, as Averroes sees it, the fact of natural science is sufficient reason to reject the skeptical argument. Still, he acknowledges that we lack complete knowledge of nature, that much remains to be investigated and that this endeavor faces various obstacles.