成唯識論演祕 7.654

7.654

答：言「曾習」者，是曾得也。此曾習道若能斷者，既應二障無始不成，以能治道先已起故。雖道曾得，而障不亡，故知曾習非能斷也。

Answer: The word "previously cultivated" means what was previously attained. If this previously cultivated path were able to sever them, then the two hindrances would not have existed from beginningless time, because the counteractive path would have already arisen previously. Although the path was previously attained, the hindrances did not perish; therefore, we know that what was previously cultivated is not capable of severing them.