Here are some commentaries on this topic. SWM, you are probably familiar with these.

My pitiful "poem" might not do the topic justice, but these might help a little.
From Liber Samekh:
"...the results of the Ritual are too various to permit of rigid
description. One may say that, presuming the union to be perfect, the Adept
need not retain any memory soever of what has occurred. He may be merely
aware of a gap in his conscious life, and judge of its contents by observing
that his nature has been subtly transfigured. Such an experience might indeed
be the proof of perfection.
"If the Adept is to be any wise conscious of his Angel it must be that some
part of his mind is prepared to realise the rapture, and to express it to
itself in one way or another. This involves the perfection of that part, its
freedom from prejudice and the limitations of rationality so-called. For
instance: one could not receive the illumination as to the nature of life
which the doctrine of evolution should shed, if one is passionately persuaded
that humanity is essentially not animal, or convinced that causality is
repugnant to reason.
The Adept must be ready for the utter destruction of hisp
oint of view on any subject, and even that of his innate conception of the
forms and laws of thought.[1] Thus he may find that his Angel consider his
'business' or his 'love' to be absurd trifles; also that human ideas of 'time'
are invalid, and human 'laws' of logic applicable only to the relations
between illusions.
"
Now the Angel will make contact with the Adept at any point that is
sensitive to His influence. Such a point will naturally be one that is
salient in the Adept's character, and also one that is, in the proper sense of
the word, pure[2].
"Thus an artist, attuned to appreciate plastic beauty is likely to
receive a visual impression of his Angel in a physical form which is sublimely
quintessential of his ideal. A musician may be rapt away by majestic melodies
such as he never hoped to hear. A philosopher may attain apprehension of
tremendous truths, the solution of problems that had baffled him all his life.
"Conformably with this doctrine, we read of illuminations experienced by
simple-minded men, such as a workman who 'saw God' and likened Him to 'a
quantity of little pears'. Again, we know that ecstasy, impinging upon
unbalanced minds, inflames the idolised idea, and produces fanatical faith
fierce even to frenzy, with intolerance and insanely disordered energy which
is yet so powerful as to effect the destinies of empires.
"But the phenomena of the Knowledge and Conversation of the Holy Guardian
Angel are a side issue; the essence of the Union is the intimacy. Their
intimacy (or rather identity) is independent of all partial forms of
expression; at its best it is therefore as inarticulate as Love."
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Notes:
1. "Of course, even false tenets and modes of the mind are in one sense true. It is only their appearance which alters. Copernicus did not destroy the facts of nature, or change the instruments of observation. He merely effected a radical simplification of science. Error is really a 'fool's knot'. Moreover, the very tendency responsible for the entanglement is one of the necessary elements of the situation. Nothing is 'wrong' in the end; and one cannot reach the 'right' point of view without the aid of one's particular 'wrong' point. If we reject or alter the negative of a photograph we shall not get a perfect positive."
2. "This means, free from ideas, however excellent in themselves, which are foreign to it. For instance, literary interest has no proper place in a picture."
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From MiT&P, cap xv, part II, sec 2
"With regard to invocations of the Gods[...] The Gods are beyond most material conditions. It is necessary to fill the 'heart' and 'mind' with the proper basis for manifestation. The higher the nature of the God, the more true this is. The Holy Guardian Angel has always the necessary basis.
His manifestation depends solely on the readiness of the Aspirant, and all magical ceremonies used in that invocation are merely intended to prepare that Aspirant; not in any way to attract or influence Him.(the HGA) It is His constant and eternal Will[1] to become one with the Aspirant, and the moment the conditions of the latter make it possible, That Bridal is consummated."
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Notes:
1. "Since this Knowledge and Conversation is not universal, it seems at first as if an omnipotent will were being baulked. But His Will and your will together make up that one will, because you and He are one. That one will is therefore divided against itself, so long as your will fails to aspire steadfastly.
"Also, His will cannot constrain yours. He is so much one with you that even your will to separate is His will. He is so certain of you that He delights in your perturbation and coquetry no less than in your surrender. These relations are fully explained in Liber LXV. See also Liber Aleph CXI."