utpattyabhivyaktyor iti saptamyantam / śabdasyotpattāvabhivyaktau ca prayatnasya vivakṣāyāś ca tulyaḥ sāmarthyabhedaḥ /
The term "utpattyabhivyaktyoḥ" has locative ending, [meaning] in the production and manifestation of sound, there is equal difference in capacity of [both] effort and intention to speak.