大乘百法明門論開宗義決 1.249

1.249

Regarding "because nature and analysis are distinct, although four, the meanings differ, etc.": "nature" refers to tathatā, because it is possessed by fundamental nature; "analysis" refers to analytical cessation, because it is attained by extinguishing obscurations. Because the two meanings are distinct, they are expanded into two; hence the Pañcaskandhaka-śāstra says there are four kinds. Both nature and analysis are the nature of nirvāṇa; therefore the Nirvāṇa-sūtra speaks of three kinds.