Every teacher or ´master ´ is but a student himself seen in a greater cosmic perspective.
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Everything should be questioned from the perspectives 1) An Honest and right Questioning has the potentional to carry a student greatly forward on his own. 2 ) No one is infallible, and every teacher, master, guide is but a student himself in a greater cosmic perspective of planetary and Solar Systems and the inner G_d as the ultimate teacher, progressive / / successive revelation 3) Several ´esoteric teachers´ do from time to time deliberately give false explanations or veil it in blinds symbolic or otherwise either A) to filter off those whom they deem are not ´worthy ´ or ´ready ´ for the truth B) which can also be connected to A, to make people train their discrimination and discernment abillities. 4 ) Sometimes those who lead ´are blind that lead the blind ´.
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So on Truth and Knowlege it is beneficial and of high value that everyone should come to their own conclusions, based on right discrimination, the use of intuitions, explorations and self-experience, to fully comprehend, realize and live what words or teachings only can be pointers towards.
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A thousand books can be read, or lectures heard but if Knowledge is not Internalized to be made ones own and experienced, realised , and Eksternalised into ones own practice it remains just words and theories .
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Towards the Within…… .in matters esoterically, symbolically, occult, metaphysical and somewhat literal, and metaphorical ….words can never describe fully ….weather written in poetry, allegories, metaphors or concrete knowledge.
The Keys to the mysteries and true knowledge are within, for each to find, experience … on their own path.
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Everything should be questioned, everything is questionable.
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If it can be questioned, it is questionable. 
Asking more of the right questions give more right answers than asking ´the wrong ´questions, birthing many new questions.
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NB: On 3 ´Hidden knowledge ´, concealment or ´blinding´ .
I can understand why some knowledge or information may be ´hidden´ before revealment until a certain level purity intent, character building, integrity, ethics is integrated eg for safety for oneself or others, or for preservation but those who hide knowledge for pride, elitism, service to self and other selfish reasons is a dark path.
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* Focus on the messengers or a teacher vs the Message or the Teaching has its polarity extremes, like idolizing or glamoring the messenger or wanting to kill the messenger, hating the messinger etc
Both in the idolizing and hate, the objectivity or maybe a needed critical thinking or discerment , is likely suspended..
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An issue connected to guruism, is idolatry and giving away power to external ´authority´ vs internal spiritual authority, and
the possible creations of various forms of dependency.
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Teachings, knowledge and distortions, symbolic and otherwise.
https://www.in-luxia.com/2021/05/02/teachings-knowledge-and-distortions-symbolic-and-otherwise/
