妙法蓮華經玄義 2.61

2.61

Third, if the distinctive teaching arises, looking toward the severance of phenomena being identical to the truth, it is still saṃvṛti-satya. Why? Because it is not the great nirvāṇa, it is still the conventional truth of birth and death, and what was severed still has relativity. If one enters the middle way of the distinctive teaching, then relativity is severed!