妙法蓮華經玄義 6.72

6.72

The present sūtra reveals the interchangeable function of the six faculties, bringing the three faculties to add two hundred toward the interchangeable function of the [other] three faculties. Free and unobstructed, they can be equal, as the Zheng fahua explains; they can contract, as in the eight hundred of the body, eye, and nose; they can expand, as in the one thousand two hundred of the ear, tongue, and mind. The sūtra says: 'If one can uphold this sūtra, one's merits will be immeasurable, like empty space without boundary, and its blessings cannot be limited.' The meaning of interchangeable function is thus made clear!