Seven Rays: LOO Vs. Traditional Esoteric Sources

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As far as I'm aware - the 7 Rays come primarily from the Alice Bailey tradition.

In the really, is much older, as written in the link I posted. Bailey is one of most recent author about the subject.

Here a link with the rays in the Bailey's vision: https://www.sevenray.org/seven-rays.html

The main distortion - as I see it - is that in that philosophy, the emphasis is very much on gaining personal power, and demonstrating this through the phenomena of siddhi's (spiritual abilities).

The most of contemporary magical systems is about gaining power. They ignore the aspects of love and wisdom to balance with power.

Ra's conception of the energy centers is more based on Acceptance and psychology. Spiritual abilities also come (to the adept), but all in due time. It's not the focus.

Yes. In the really, that's the only vision which makes sense. Once the energy centers are parts of one thing, we can't penetrate a higher center before the basis be builded.

I knew someone who was inside that tradition (as a teacher), and they were aware of the Law of One as well. But there was no easy overlap between the 7 Rays (of Alice Bailey), and the red to violet rays of Ra.

As I said above, we need to use the hermetic principle of conrresponce to correct "overlap", as you call this. So, for example, the green-ray is always about love and healing. I don't think LOO is the less distorted because the source itself, but because makes more sense. Mainly if compared with hindu sources, the less distorted sources after LOO.