nīlādijñānajanakānnīlāder bhedavadyathā / śrotraṃ na tasya janakaṃ tathā cakṣurapīṣyatām //
Just as the ear, being different from blue etc. which are productive of the cognition of blue etc., is not productive of that [cognition], so also the eye should be considered [non-productive].