In Kantism philosophy, ＂intellectual intuition＂ is an ability to intuition and create ＂things in themselves＂ without sensibility and category which is not available to human beings. While Mou Tsung-San believes that Buddhism's Prajñā is equivalent to ＂intellectual intuition＂ and assuming that if Buddhahood is possible and Prajñā is true, one must admit that people have ＂intellectual intuition＂. Therefore, he interprets the ＂Three Thousand per Mind＂ of the Tiantai Sect as ＂Three Thousand per Mind＂ and ＂Three Thousand per Wisdom＂ and explains from the perspective of ＂Three Thousand per Wisdom＂ that Prajñā, as the ontological source of all Dharma, meets the requirements of ＂intellectual intuition＂. Meanwhile, he tries to prove that Buddhahood is possible according to the doctrine of ＂Buddha-nature Treatise＂ of Tiantai Buddhism. There are certain problems with the argumentation above. Firstly, Prajñā and ＂intellectual intuition＂ cannot be equated. Secondly, ＂one can become a Buddha＂ is not suitable as the premise of rational argument. Again, even if the first two aspects are admitted, it cannot be proved that people in reality have ＂intellectual intuition＂.
