Here is what I mean by 'justification.'
In many of Lovecraft's stories, such as 'Call of Cthulhu,' mortals encounter terrifyingly unfamiliar beings that induce insanity. But despite the obvious fictionality, I notice that the occurrences are designed in a way that could be possible.
For example, Cthulhu is a creature from another part of the universe, and maybe even a different dimension, and his body and power is simply a side effect of his entry into our reality. In short, Cthulhu is 'permitted' to do things that we aren't. His similarity to earthly beasts could either be a cosmically vast coincidence, or he could be so eldritch that we can only perceive a dragon with an octopus head before permanent insanity.
This is my favorite concept: the idea that something is real, but so unfamiliar that we could never handle it without death or catatonia. And those fortunate enough to survive, in complete honesty, don't really count as 'alive' anymore.
That being said, is there a term for this concept? In drafts of my ideas where this takes place, I used a placeholder term that is found in Bloodborne, 'the eldritch truth,' but I've never figured out what that is exactly (though I enjoy that game for its use of Lovecraftian themes, such as severely mutating from eldritch wisdom).
I would like to know the true term for the concept, please.
(And if someone can define the eldritch truth, that would be nice as well.)
Also Spoilers, if that even matters by now
A detail I remembered: In the movie Kingdom of the Crystal Skull, the main antagonist wanted to learn the near omniscient knowledge and secrets that the aliens knew, to which they seemed happy to obliged since it seems they were waiting for the skull to be returned and were thankful. However, a mere mortal's brain couldn't process the knowledge, and the antagonist was reduced to a wisp of glowing dust.
So there's that kind of 'eldritch secrets' to consider.
sigh Another Edit
I had just thought of something interesting. As CAgrippa stated, and to which I agree, an 'educated' and 'sane' person has a grip on their reality that eldritch secrets can loosen and dispense with. But is there a way to condition yourself against, or avoid altogether the death, mutation, and madness? I've thought of two different methods to use.
I learned that in the story BLIT, mentioned by Thucydides, some of the children had apparently taken turns staring at the brain-destroying images to see how long they could go, and eventually built an immunity, which made me wonder if a person could attain the knowledge and retain their life at the same time by doing something like looking at excerpts repeatedly.
Because if they could, then it may mean that a civilization could attain this knowledge by risking one sane person, or offering an insane person, to learn these secrets in that manner, and transcribing it to a sane person in a way that protects them.
Then there's the revelation I had upon consideration. CAgrippa stated that some people could pass off the secrets as magic, keeping their mental grip strong. What if a person acknowledged that there are things that are real, but so strange that they break our understanding of reality? Could they already be immune to madness?
And if a character simply acknowledged that to themselves before turning to see the book or beast behind them, could they look upon it safely, with at the most a fainting headache?