As a Stoic, the closest I have to "holy scriptures" are the writings of ancient Stoic, Neo-Stoic, rationalist, and contemporary Stoic philosophers, who don't agree with each other on everything. The figures that are seen as the most influential in the Modern Stoic movement are ones that I have disinterest in.
I'm already considered to not be a true Stoic by many other Stoics. Half of them think that my beliefs regarding the importance of seriousness, the suppression of emotional expression, and my condemnation of love are too far and constitute a form of dangerous extremism. The other half think my failure to condemn LGBTQ+ movements, my disregard for authority, and my non-conformity are degenerate.
In my opinion, both of these groups have violated the core values of Stoicism. The former has loosened their morality and the latter misunderstands it. So it's fair to say that the disagreement runs both ways. It's to the point that I now usually avoid identifying myself as a Stoic, because I don't want to be associated with these groups that have monopolized the conversation.
Luckily, I think this obsession with Stoicism is probably a passing fad of our zeitgeist, and all of the poseurs will leave for the next trending philosophy. I didn't get into Stoicism because of the manosphere or because of some self-help fraud like so many of them seem to have. I entered Stoicism through my study of philosophy, particularly the history of logic and rationality, and that's where my interest lies.
I don't stop at Marcus Aurelius, I've read Zeno, Chrysippus, Epictetus, Seneca, etc. and even examined Neo-Stoicism through monastic teachings such as Ignatian spirituality. I look to Descartes and Spinoza more than Musonius Rufus. I read about Einstein's contributions to pantheism, a label which was invented to describe Spinoza's beliefs that he adopted from the ancient Stoics.
The "highest authorities" (i.e., the most influential modern Stoics) have interpreted Stoic philosophy in a wide range of ways that I disagree with. Even when I agree with their interpretations of a specific Stoic philosopher, I can often find a counter-point to that philosopher's position made by other Stoic philosophers.
For me, it's not about what the authorities say. It's about what logic dictates. That is the spirit of Stoicism; to live in accordance with reason.