prayogaḥ yadyadavyatiriktaṃ tat tasmin saṃvedyamāne saṃvedyate yathā nīlādisaṃvedanāvasthāyāṃ tasyaiva nīlāder ātmā nīlādavyatiriktaś ca śabda iti svabhāvahetuḥ
The formal argument [is]: Whatever is non-different [from something], when that [something] is perceived, [it] too is perceived—just as when blue and other [colors] are being perceived, the essence of that very blue [is perceived]; and sound is non-different from blue—this is a reason based on essential nature