In regards to scrying vs. traveling through the Aethyrs (along with the difference between evokation and invokation), the magickian whom scrys or calls upon the Aethyrs without having developed his Khu, is limited by his Khu. It is the Khu that must attain mastery of itself in order to travel. The Khabs is under no such constrants; it can permeate all Aethyrs (as that is where its from).
Just as evokation is the arousal of a part of the microcosm within the microcosm, scrying the Aethyrs is the exploration of the macrocosm within the microcosm.
Invokation being the drawing upon the macrocosm into the microcosm; traveling through the Aethyrs is the microcosm exploring the macrocosm.
The answers lie in the reformation of one’s questions and the challenge is perseverance in actively assimilating opposites.
The Work never ends, and stagnation in any aspect is detrimental to the whole. Balance is key, and true balance is harmony. The tao is forever in flux; the equilibrium and unification of the pentagram and hexagram being the goal of the magickian.
What is considered the “objective reality” or that which can be known a priori, the universal, self-evident, consistent and singular truths are objective insofar as we can conceive of them; and “subjective reality” or that which is known a posteriori, including every construct made from experience, be it social accretions, religious systems, ethics, etc. exists insofar as we can perceive them– but the concepts of objectivity and subjectivity are merely distinctions made within the mind.
The harmonious unification of the microcosm and macrocosm can be symbolized as the integration of the only-conceivable with the only-perceptible. The only way to preserve Truth is to not claim to Know it; thus Qabalah is a diagram of the universe at scales which man can know and utilize.
Man is neither above the universe nor trapped within it, but is part of the system–the Magickian utilizing the elements to do the Great Work.
“Kether is in Malkuth and Malkuth is in Kether, but after another manner, Malkuth reflects Kether, for that which is above is like that which is below, and that which is below is like that which is above.”