pratiṣedhadvayasya vidher viṣayatvāt pacatītyetat svarūpeṇaiva vidhyātmanaiva tiṣṭhatīti vidhir eva śabdārthaḥ syāt
Since a double negation has affirmation as its object, this [form] "pacati" remains in its own form, that is, in its affirmative nature, [and] thus the meaning of the word would be affirmative only.