A proposal

[Aion]

I think what 'Ra' is implying with that quote is that since the adept's thoughts are so much more amplified there can be a more powerful manifestation. Now keep in mind, in the question Don talks about 'retracing steps', and so Ra never said that a positive can switch to a negative. They said someone on the positive path can switch to the negative path. This is a very different thing. Though an advanced entity may have an 'easy' time switching, they still are starting back at the 'beginning' of the new path. So I agree that I think there is a total loss of polarity when one switches paths. That's the sacrifice you make.

If you have followed a path of negative and wish to switch you must sacrifice your dark power. If you have followed a path of positive and wish to switch you must sacrifice your light power. This is actually seen as archetypal and both stories are told throughout history. The good turning to a path of evil sacrifices all that is good in themselves and their lives. Those who turn from the path of evil to a path of good must take extreme labours to sacrifice the evil they have harboured, often through much suffering. These are tropes that have existed for ages.