What do we have as a known constant that demonstrates the ultimate truth?
emptiness is not nothing in this pilosophy!
Oh, but it is.
It's the void, the place where even our personally accepted canon of silence is too loud. It's meant to represent a placement of zero in a world of numbers, a point where things shut off and what remains shows itself differently. They are effectively partitioning nothingness in the hopes of finding it's entirety eventually.
Nothing is not nothing in the satya of existence, but it's still more than the void in that you can still see what isn't somewhere in nothingness, you can sense what is missing which itself has an implicit substance. Void by it's nature is devoid of even the sense of what's missing.
Basically to give you the essence, this is the middle path beyond the extremes of nihilism and eternalism.
The middle of the two'd be materialism, the Earth in the Heaven and Earth model (with Nihilism as the Underworld).
It is just semantics and word porn from you at this point. Your words seem to have nothing to do with the topic.
It's not my fault that you don't understand your own chosen philosophy.
No, materialism is usually nihilism.
Nihilism sees no point in material things, and lends towards asceticism.
Because if you examine, you find that neither self nor phenomena have inherent existence.
That's a pretty bold claim.
How is it we can know that these things have no inherent existence?
The point is that if something is subject to causes and conditions it means it is compounded and not really inherently existent (through itself), so it can't be ultimate truth. We cannot really say how things exist, we can only say how they do not exist.
Does a thing have to be an ultimate truth to exists? Why can things subject to causes and conditions not exists? If it has a condition or can be causes to have an affect, does it not exist? If we can't know how a thing exists how could we know how it can't exist? If we can know how it can't exist, couldn't we infer the ways it can?
Basically to give you the essence, this is the middle path beyond the extremes of nihilism and eternalism.
How can we know essence, how can we gain essence, how can we know we've gained it? If there are essences are there not things? For there to be an essence does their have to be a substance? How can a substance not have an essence and then have an essence by some cause?