yato vivakṣāyā asammukhībhāve śabdasyāprayogāt tatkāryatvād bhūmavajjātavedase gamaka iṣṭa eva, natu vācakarūpeṇa
Because when there is no presence of desire to speak, the word is not used, [and] being its effect, it is indeed accepted as an indicator of fire-born [i.e., fire] like smoke, but not in the form of a signifier.