All this is part of the Oratory part, these concepts must be understood because they have a direct impact upon the Lab expression of an Alchemist, because it is a reflection, a mirror of the interior level of perception of the BONE !
The perception and understanding of the Book Of Nature's Expression depends a lot of the Hermes in the Hermetist. The Hermes is this "something" you have, this knack and this fire in the deepest place of your heart for the breaking/understanding of the Matrix. What is the Hermes if it's not a spirit ? It is the abaility to see through the old vision. The old vision is the cultural one, the parental one, the delusionnal one. The one that makes you believe in false things. This hallucinatory state is based upon a vision without understanding of what surrounds you. It's like living a in chinese dictionnary and not understanding a single word !! (or Hebrew one ... ;) ) When you begin to perceive ... damned ! You begin to have the code ! There IS a code ! There IS a designed and functionnal Pattern. Oh WOW, S**t !! This happened by the medium, the hermes is you, able to unlock the locks in you. It will not unlock something out of you, but you will then be able to unlock things in this world (I didn't said out of you, because it's not the case, there is nothing out and nothing in... because what's in is alike out, and vice versa... so look at your life and tell me what's in you !!).
Anyway, seeking the "lost" Book Of Nature's Expression is passionnating. And it is a marvellous quest. It's very very rewarding spiritually.