tāmrādikāṭhinyasya hi yo virodhī vahnis tasya kādācitkasannihitatvāt kāṭhinyādes tadabhāva eva bhavataḥ punas tadapāyād utpattir yuktā /
For in the case of the hardness of copper and so forth, its contrary, which is fire, is only occasionally present, [and] the hardness exists only in the absence of that [fire]; thus when that [fire] disappears, its arising again is logical.