Asat Aurora bhotik Sareer ka to koi chirastivaa nahi.

Asat ka bhotik sareer ka koi chir astitva nahi lakin sat aparivat hai.

The constantly changing voice is asat because it is not stable, sat is in the present moment always, even the old thought is just new in present moment. This is happening in this field of sat, knower.

There is a senes of I in between. Which is also going and coming.