It is very easy to know that all of the exsistence essence in end is zero a state of not. But zero is the pure infinite potential this is also very easy to understand. All of this explanation comes from experiment so instead of just believing it try to look up on yourself.
We know about oneness it is in our experience. The proof is simple experience and experiencer are both exsist now nobody exsist without other and nobody exsist one in other both exsist at same time.
Now let's come to the part to proof how zero which is simply zero is essence of everything and infinity potential.
Before that what is zero state? Nothing can be smaller than this. It is state of not knowing. It is absence itself. It is not knowing. It is void. It is nothingness. It is emptiness.
Now back to proof of how zero is essence and how it is actually is infinite potential.
What is essence of oceans, river, lakes, rain etc? It is water right. We cannot find anything smaller than this in terms of essence for water right? In this way zero comes after that. Now some smart person will no essence of water is molecules, or molecules also have essence which is atoms or after that vibrations.
So see here proofs that everything which finds out as smallest part will eventually leads to zero and zero becomes relative to everything.
Like when water is smallest zero become relative to it. Similarly when molecules become smallest essence zero becomes relative to it , similarly for atoms and vibrations. From this we can clearly see that how zero shows essence of everything and we can also see the infinite potential of zero.
Because zero becomes relative every single thing like for water for molecules for atoms for vibrations.
So this proofs that zero is essence of everything and also infinity potential. What we experiment is based of only one part of existence i.e. nadh you can see nadh i..e change.
Other part is of consciousness i.e. experiencer which also leads to same conclusion. Experincer is zero in itself it is formless or cannot be experienced.
The main reason behind this explanation is to show how zero is infinity potential.