In "Decisive Treatise", Averroes argues that philosophy—which for him represented conclusions reached using reason and careful method—cannot contradict revelations in Islam because they are just two different methods of reaching the truth, and "truth cannot contradict truth". When conclusions reached by philosophy appear to contradict the text of the revelation, then according to Averroes, revelation must be subjected to interpretation or allegorical understanding to remove the contradiction. This interpretation must be done by those "rooted in knowledge"a phrase taken from the Quran, 3:7, which for Averroes refers to philosophers who during his lifetime had access to the "highest methods of knowledge". He also argues that the Quran calls for Muslims to study philosophy because the study and reflection of nature would increase a person's knowledge of "the Artisan" (God). He quotes Quranic passages calling on Muslims to reflect on nature and uses them to render a "fatwa" (legal opinion) that philosophy is allowed for Muslims and is probably an obligation, at least among those who have the talent for it.