Nyāya Sūtras 27.2

27.2

atha siddhāntaḥ, idam itthambhūtañ cety abhyanujñāyamānam arthajātaṃ siddham, siddhasya saṃsthitiḥ siddhāntaḥ, saṃsthitir itthambhāvavyavasthā dharmaniyamaḥ/
sa khalv ayam ---

Now, established tenet: A collection of objects accepted as “this is so” is established; the established standing of what is established is an established tenet. “Established standing” is the definitive settlement of being so, a restriction of properties.
That very [established tenet] is—