大乘入道次第開決 1.191

1.191

壞證微妙淨相法者。謂若能斷雜染相法。便能證得妙淨相法。淨相法者即是真如。相者即是體相義故。由不能斷雜染法故。正智壞滅不證真如。故云壞證淨相法也。

"Ruining the realization of the subtly pure marked phenomena" means: if one can sever defiled marked phenomena, one can realize subtly pure marked phenomena. Pure marked phenomena are tathatā, because "mark" means the essential mark. Because of being unable to sever defiled phenomena, correct wisdom is destroyed and tathatā is not realized; hence, it says "ruining the realization of pure marked phenomena."