Wow , you guys criticise quite harshly on him.
I may not agree with everything he have said in his post , especially his classfication , terminology and some others.
However the idea of Higher and Lower Selves , a person's multiple bodies such as the Etheric Body , Mental Body, Astral Body and Soul is a well established concept and idea.
This idea and concept is integrated into many Magical Systems.
There are also many forms of Projection out there that also supports the idea of a person having multiple bodies.
In fact , I am of the opinion that a fair number of Magical Workers are a believer of this concept.
Now , moving on to the idea of belief. Yes , it is not proven by Science but how much of Magic actually is proven by Science? SpellCasting is not and cannot be supported by Science , that makes it a belief too if you go by such narrow definitions.
A large number of Magical Practices cannot be supported by Science such as Spirit Work , Diety Work , Channeling , the list goes on and on and on.