STS viable path toward Unity?

[IndigoSalvia]

I came across a Q'uote re STS and STO. Reminds me of what jafar mentions re that which IS and that which IS NOT. 

... If God or the infinite Creator is all things positive and negative, why is there a mandate that all sixth-density negative entities must convert to positive in order to advance in their evolutionary process in moving into foreverness?

We are those of Q’uo, and are aware of your query, my brother. 

The nature of the negative path determines its limits, my brother. For the negative polarity is the path of that which is not. The heart of the negative polarity is a lie. That lie is separation. 

The negative polarity is based upon skipping the development of the heart chakra and developing the ability to use the gateway to intelligent infinity without the use of the heart. This is possible and acceptable to the one infinite Creator. Yet, the creation is as it is. All is indeed one. Therefore, the path of positive polarity is the path of that which is.

The path of that which is not has its ending, quite naturally, in the density of unity. Entities who have denied that they and their brothers are one are able to work with fourth-density light without releasing this supposition. They are able to work with fifth-density light without releasing this supposition. They are able to continue to grow and to develop throughout the densities of love and wisdom by assuming that love is of themselves and of the Creator, and that wisdom is their wisdom and the Creator’s. They can still maintain their separateness from other entities.

However, sixth density is the density of unity, and it is glaringly obvious to the negative entity as he moves into sixth density that he is approaching a brick wall. He cannot advance any further. It is the nature of energy to change. It is not the nature of energy to stop. Consequently, there is pressure upon the negatively-oriented entity to continue to evolve. And yet, he cannot evolve and still hold onto the belief that he is separate from his brothers.

Consequently, just as a convert to Christianity goes from being a hardened sinner, in the terms that this instrument would use, to being the most fervent convert, so the negatively-oriented entity, at one moment of realization, switches polarity and becomes the most fervent follower of the truth that all is one. It is an inevitable reaction to the impossibility of further advancement without making that tremendous change.

https://www.llresearch.org/channeling/2008/0210_04

I've wondered this many times, as probably you have as well: Isn't STS kind of the same as STO when we view the one/infinite creation in its nature as indeed one/infinite? For when one aspect (or element) of Us helps another aspect (or element) of Us, this can be both Self-serving and Other-serving when Self and Other are one and the same? 

The difference, it seems to me, is that we are moving toward unity (realization of our One-ness) or separation (denial of our One-ness). 

IS = unity (STO until 6D)?
IS NOT = separation (STS until 6D)?

Sounds like we can maintain this illusion of separation through 4D and 5D, and during 6D, this illusion of separation (and of two distinct polarities) dissolves.  

I've always understood that STS becomes STO (as in, one-way), but after contemplating and reading more: could it be a two-way merging? Since any service - when creation is seen as one/infinite being - is both STO and STS. 

When I re-read this post, the questions seem both basic and profound, like I'm both familiar and unfamiliar with it at the same time. 

Thoughts?