The only duality concept I lean more towards is Right and Wrong. No matter how much we try to argue that there is no absolute right or wrong in many worldly situations, there actually is. We just have the hardest time accepting these as we like to live and wallow in our own excrement and call it gold. Just my personal opinion I eventually came to over the many long years of wasted energy.
This. The truth that was hidden behind the two lies of LHP&RHP. Glad you brought it up and thank you for sharing your acquired wisdom.
"We have granted Moses the Torah (or Kitāb, the book) and discernment (Furqānan) - perhaps you will take to the right (as opposed to wrong, not to left) way."
Discernment is the ability to interpret the Kitāb and to know right from wrong in life, which cannot be codified in law. This is key ability that is granted to man by God, and by which man can be saved. Not in afterlife, but in real life, the man and humanity as a whole can be saved with use of the discerment ability by their own will(!).
It is essential that man uses his power of discernment by his own choice, and that is one of the targets of all shaitans - they can't take away the power of discerment from man, or change the reality (the book), but they can try to trick man by providing him with false choices, so instead of chosing what is right, man would try to chose "the lesser of two evils". They try to fabricate such a worldview for people, in which there would be no right way. Truth is their enemy.
We can see that in all the West with absolutely fabricated, virtual, reality that is imposed on reality that is. The truth is being rooted out. The occult is just one segment of culture. They work all of them. And the way they do it is by exploiting what Al Ghazali pointed out in my earlier quote - the man in the making is a combination of pig, dog, devil, and only partly a human. It is improper to think a human is complete at birth, it must grow into being full human. That is being attacked on all levels available to shaitans. God helps, but if man doesn't exercise his will and doesn't use discerment, and would not develop absolute intolerance to falsehood, he will die and humanity will die.
LHP&RHP could make sense in India, but more often then not (always) it seems Theosophy and such butcher the original, lose the context, pervert the idea, and return it in a corrupt way, they are shaitans.