Let's start with logic & Plato's ideas on "absolutes".
This will help explain the use of the word Absolutely in reference to everything and nothing.
Everything literally means every thing, (object, particle, energy, matter, anti-matter, etc...)
Nothing literally means no things, (object, particle, energy, matter, anti-matter, etc...)
Absolute Everything & Absolute Nothing are opposites, exact opposites
See references below on Plato’s ideas:
Plato described a dichon(total_absence_of_change, only_appearance_of_change),
based upon, we believe, an invalid interpretation of Zeno's paradise.
Plato's ideas, ideals, 'principles,' and concepts are absolute and changeless.
His version of change is only apparent, illusional, delusional to observers.
Aristotle invented a notion of 'substance' as absolute in place of Plato's ideas as absolute
which can be represented by nomenclature, thus symbols.
from URL:
http://www.quantonics.com/How_Classicists_View_Reality.html
What Did Plato Mean by "Absolute"?
Since his idealism was based on the belief that all knowledge resides within the spirit of an individual, Plato certainly sounds like a constructivist. But then again, he believed innate knowledge to be not only good and perfect, but also absolute - not entirely a constructivist approach. This, at first glance, could seem to belie his constructivist approach. Plato, recording the teachings of Socrates, actually divided wisdom into two categories: knowledge and belief. He proposed that the perception of absolute reality constituted knowledge, while most of what we commonly refer to as knowledge is simply our perception of "a representation" of absolute reality (Crombie, 1962, p. 102).
Reference
Crombie, I. M. (1962). An Examination of Plato’s Doctrines. London: Routledge & Kegan Paul.
from URL:
http://www.coe.tamu.edu/~kmurphy/classes/telecom98s/learning/plato.html
Plato used the realm of Forms and the absolute Truth as his foundationblocks in describing the origins of the cosmos.
It was Plato’s belief that the visible physical world, the cosmos, has been fash-ioned by the Demiurge based on its eternal Form. For Plato every object in ouruniverse, the realm of becoming, has been created after the likeness of its respectiveeternal model in the realm of pure and absolute Truth. Plato named the realm of pureand absolute Truth the realm of being, because absolute Truth is perfect, unchanging,immutable and ever-present. He named the universe the realm of becoming, becauseof its volatility and its unpredictability.
from URL:
http://216.239.57.104/search?q=cach...story/plato.pdf+Plato+Absolute&hl=en&ie=UTF-8
And these you can touch and see and perceive with the senses, but the unchanging things you can only perceive with the mind -- they are invisible and are not seen?
That is very true, he said.
Well, then, he added, let us suppose that there are two sorts of existences, one seen, the other unseen.
Let us suppose them.
The seen is the changing, and the unseen is the unchanging?
That may be also supposed.
from URL:
http://plato.evansville.edu/texts/jowett/phaedo5.htm