妙法蓮華經玄義 6.37

6.37

Here one should formulate four positions: self, other, both, and without cause. Refuting these essential natures, none of them are tenable. Because these four positions do not exist, there is no essential nature. Because there is no essential nature, it is only in worldly names, within the four siddhāntas, that active and passive stimulus and response are discussed. The active responder belongs to the Buddha, and the passive object of response belongs to sentient beings; the active stimulator belongs to sentient beings, and the passive object of stimulus belongs to the Buddha. If one were to turn this over and produce various alternative formulations, conventional names would become confused and indistinguishable. Although such names are formulated, these words do not abide; because these words have no real existence, they are like dreams and illusions (and so on).