varṇavijñānānantarabhāvinī cārthadhīr iti svabhāvahetuḥ / kāryatāvyavahāraścātra sādhyate / tena sādhyasādhanayor bhedaḥ //
And the cognition of meaning follows immediately after the cognition of letters - this is a reason based on essential nature. Here what is being established is the relationship of effect. Thus [there is] a difference between what is to be proved and what proves it.