prayogaḥ yadyadutpattimattvanāśitvādidharmayogi tat tadacetanam yathā rasādayaḥ tathā ca buddhir iti svabhāvahetuḥ
The formal argument [is]: Whatever possesses the properties of being produced, being perishable and so forth is unconscious, like tastes etc.; and such is buddhi - this is a reason based on essential nature