“...from the first three books of the Bhagavad Gita. The problem of Arjuna is the problem of all disciples and the solution is eternally the same..."

Correct, my friend, you’re getting closer to the truth.
You should learn, though, to cut the words in ‘old tales’ and recognize under them the most straight indications for the truth. I hope I will help you by giving you some points of reference.
The first fight, as you say, doesn’t occur between the physical personality and the Soul, but between the clever Instructor who tries and distracts the attention of the conceited ‘little monkey’ that is the postulant, who wears his crown of vanity.
Unfortunately if many people ‘choose’ to stick to the ‘world of words’ as many want to stay into the ‘nest’ of their initiatory childhood.
The ‘choice’ of the Pupil is a subsequent stage and occurs when he is ‘sent away’ by the Instructor because it is time to rely (if he wants, this is the choice) on his inner Instructor (the Ego), messenger of the soul. The soul is the first occult Master of the inferior self. We must clarify that the Disciple is the soul, not the impermanent self of the inferior self.

An Instructor doesn’t reflect himself but rather the will of the Ego (the quality of the ray) of the Pupil.

The Aspirant becomes Pupil after he’s been ‘accepted’ by an Instructor who, on his turn, has been accepted by a Master of the Hierarchy. You become Disciple in Trial when you accept to be guided by the Ego. In this way the personality from egocentric becomes transpersonal (abstract).
You become Accepted Disciple when, once completed the Bridge (of conscience) that joins to the Soul, the inferior self blends with it. Personality and Soul, then, so joined, become the incarnation of an Initiate (3rd Initiation).
I think this is enough for the moment.

Fraternally
Esonet’s Editorial Staff