Great Q!
Here is my understanding from Shankara's commentary on BG verse 2:16.
Firstly, any effect, like a pot, when analyzed is NOT different from its cause, clay. Thus, as effects, they are unreal. Thus, all transformations, are NOT cognizable apart from their causes and hence are unreal. Anything that is mutable is unreal for it is unknown prior to its origination and unknown after its destruction.
The objection to this is: "If the totality of causes and effects be unreal there arises the contingency of an absolute vacuum".
Response: No. There are two types of cognitions - Cognition of the real and cognition of the unreal. That ALONE is real whose cognition ITSELF is immutable. Examples of true cognition are "The pot is", "The elephant is" and so on. Such cognitions consist of two parts - particular (pot, elephant, etc.) and "is"ness. This "is"ness is what is common to EVERYTHING.
Objection:When the pot disintegrates, the cognition "The pot is" ends.
Response: Yes, but the "is"ness is still available unchanged with respect to other pots and other elephants, for example. So, the cognition of "is"ness is absolutely imperishable.
So, in summary, "is"ness is a qualifying attribute for ANY AND EVERY COGNITION and is the common essence of ANYTHING AND EVERYTHING.
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