In his book , Poya discusses the concept of tolerance and seeks to justify the incorporation of this concept within the Islamic thought by relying on Ijtihad . Drawing from some concepts raised in the notion of Ijtihad, he elaborates on refutation and confirmation as a potential way to justify the idea of tolerance in Islamic thought. In this book , confirmation to other realms of human knowledge including religious sciences, and proposes some ways for the incorporation of the notion of confirmation within the Islamic thought.