Before understanding that why everything is in zero state we must first understand zero state.
What is zero state? - it is simply nothingness. And what is nothingness? Nothingness simply means the absence of experiences. When there is no experience we can call it nothingness. But point to be noted here no experience means nothingness. Not our imagination thinking about nothingness like something Balck screen that would still be an experience.
So how come everything is in zero state?
We all know experiencer is already in zero state we discussed it. Now the most interesting part comes is that how come experiences itself is part of nothingness?
What is the essence of experiences? The essence of experiences is change which is know as nadh. Just like the essence of us is experincer.
So if you try to find out the essence of experiences then it would still come from change right? Like jumping from one experience to other one happens because of change. This is why the essence of experiences itself is change. How come this nadh or change is zero?
Because no matter what we cannot experience this change itself. We could see it's image just like we could see image of experincer but cannot see it. So both the experiencer and experiences essence is nothingness, a state of zero.
If we try to look for or try to find the essence of change itself we will simply fail. The smallest understandable part of zero is experincer and nadh. We cannot go smaller than this. Both make together oneness.
We cannot go smaller than this. Smaller than the oneness that is experiencer and experiences essence is simply a zero state.
A state of nothingness.....
This is the defination of zero state......
I hope you find this helpful........
Now maybe you also can get idea that why most spritual teacher says things like that everything is illusion..... Because of part of nothingness.....