成唯識論了義燈 2.144

2.144

答：二智俱能證於理，但有聖法名聖性，所知定姓無斷時，不障聖法非異生。若依彼立，得聖許斷，即違諸論說，所知障唯大獨斷。若不能斷，既許障在寧得聖性。由此故知，但依一立，如所知障在二乘身，不名為障，不礙彼果，名無覆故。

Answer: Both kinds of wisdom can realize the principle; having any noble dharma is called the noble nature. For those of determinate lineage, when [the obstruction to] knowables has no time of being severed, it does not obstruct noble dharmas and is not 'ordinary'. If it were established based on that, and upon attaining nobility it were allowed to be severed, that would contradict various treatises stating that the obstruction to knowables is severed exclusively by the Mahāyāna. If it cannot be severed, yet the obstruction is admitted to remain, how could they attain the noble nature? From this it is known that it is established solely on the basis of one [obstruction]. Just as the obstruction to knowables in the person of the two vehicles is not called an obstruction because it does not hinder their fruit, it is termed unobstructed.