The first key is workability. The second key is unlimited application.
While I uncovered Huna early on, it wasn't until I needed answers to other questions that I started using it in earnest.
This has been the key with all those who I've found who work with this material. Tad James, who was known for his work in psychology and NLP long before, said that Huna actually explained all the left-over questions he still had after years in other fields of the mind.
That is what happened for me. While Charles Hannel ("Master Key System") and Thomas Troward ("Edinburg Lectures") explain how this world works in no uncertain terms, there are still gaps.
And so I mostly refer people to the 7 principles of Huna as an introduction. These are the bottom-line core answers to most questions still remaining. As well, the rest of Huna (for the most part) tend to solve other difficulties.
Huna, like any study, is best done broadly. King explains that there are three main approaches to this subject, and that every family of practitioners had their own practices and preferences. King was adopted into the Kahili family, while others such as Daddy Bray and his lineage (which James studied under) has a slightly different approach.
Max Freedom Long was mostly self-taught. At the time he was in the islands, no kahuna would share data with him, so he had his breakthrough studies after he moved back to the states.
This is also explained somewhat by Laura Yardley's "Heart of Huna", which covers Bray's approach and also Long's.
King has long said that this is a study of workable truths. You use what you find to be effective for you. And so Huna isn't selective or dogmatic in what it teaches. You can and should test and evaluate everything you study in this and every other subject, then adopt only the really effective techniques as part of your box of tools.
Similarly, Huna is inclusive of all other effective truths. (And usually has better explanations for why they work.)
My own tool-set includes Silva, Levenson's releasing, and Hill's "Think and Grow Rich" book, as well as Nightingale's "Strangest Secret" and his recommended Dorothea Brande's "Wake Up and Live!".
But I've found that the simple basics of Huna explains why all of these work.
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The next point is that this can be applied anywhere and to any situation.
When I saw that self-help as a study was finite (which occurred at the end of "Freedom Is" research), I knew that the rest was going to be spiritual training.
And while leaving all of this settle for awhile, I then picked up Huna again in earnest. The material King and LaTourette discuss about the shamanic approach brought this all back around again. LaTourette was interesting in that (as I've mentioned) he brought both Silva and NLP practices in (going to level and timeline therapy), it was still a very workable approach.
King seems to be the only one who is explaining the shaman approach. And in reading his "Urban Shaman" (still not complete at this writing) I can see why. His purpose is to create more shamans to help handle this planet and universe as it exists for us. King had all this knowledge and saw that his job was to teach it and enable people to find it.
And that aligns with my own purposes.
Hopefully, it is also workable for you as you read this.
Another reason is that most of the best books on Huna seem to be out of print (Urban Shaman, Heart of Huna, Long's materials). So I work to bring these back as I can.
But my own work in this line is to share it as I start incorporating it in on top of all that I've researched on self help.
You'll also see that I'm now onto an approach which is beyond what is covered in what I've studied through individual authors. And this is a self-study shaman course. You have front-row seats for it.
For all of us - let the blessings fall like rain.