瑜伽論記 20.31

20.31

解初門中，若無遍計所執當有何過，答：於依他起性中，應無名言執等者，從昔已來皆於依他名言起執，由執搆畫，起彼依他生死染法，斷染得淨，若無此性無名言執。此若無者，應不可知雜染清淨，無後二性過可知。

In explaining the first gateway, 'If there were no parikalpita, what fault would there be?', the answer states: 'In the paratantra nature, there would be no grasping of nominal conventions, etc.' From the past until now, grasping has always arisen with respect to nominal conventions on the paratantra; through the construction of grasping, the defiled dharmas of saṃsāra of that paratantra arise; by cutting off defilement, purity is attained. If this nature did not exist, there would be no grasping of nominal conventions. If this did not exist, defilement and purity could not be known. The faults regarding the absence of the latter two natures can be understood [accordingly].