In chapter 13 of the Bhagavad Gita, Lord Krishna brings up two terms to define Creation.
He says there’s the Kshetra, the material world. And the Kshetrajna, us.
This seems easy enough. We know this distinction already. The material world around us is insentient, and so indeed that must be Kshetra. And we are alive and kicking, so we must be Kshetrajna. So what’s the big deal here?
The big deal is, that Kshetra includes not just the material world according to Krishna, but also our body and mind! So the physical and mental aspects of ourselves is also part of this relative insentience – even though maya makes us feel otherwise.