What does polarization mean? Are there 3 polarities?

[Infinite]

But I was trying to describe it from the subjective, personal perspective, for whatever that may be worth.

From the same session:

We are aware that each here pursues a path of seeking the opening of the green-ray energy center as the primary portion of your journey through the third-density illusion. To be able to open the heart in what is called “unconditional love” in more than 51% of your thoughts, words, and deeds is considered an harvestable quality or quantity for entities to express love for those about them.

What do you think "efficiency of energy expenditure" means, exactly.  Is it merely flow vs. impedance, or do you feel there is more to it?

Something like this:

The principal effort typical of third density meditative work is the opening of the heart chakra— or the green ray energy center—for only when this center is opened can work in the higher centers be engaged in a way that reflects the polarity we have called service to others.