Chapotraphouse

Nietzsche believed in endless struggle and totally self-determined values, so the sort of information he was given here, if it included the conviction that it was true, probably would very deeply disturb him.

Also separate from that, "absolute knowledge" seems like it would be an extremely dizzying thing. Even if it was positive overall, I think it would still result in someone being quite shaken. Speaking for myself, I of course would say "the meaning of life" or any understanding of "the point of existence" as a prescriptive value statement are fantasies, but supposing they were real, direct knowledge of "objectively true" values is something many people agree humans do not have access to, so even if that's a valid idea, you can reasonably argue that that kind of thing requires transforming someone's mind in order to be able to meaningfully hold that information*, just like how we might more readily agree that on some level "the truth of the universe" might involve things so distant from anything we were evolved to handle or could ever encounter in the real world (not to mention so much information) that it would likewise involve changing our underlying cognitive capacities.

*this looks like a leap, but I would argue that totally inaccessible structures of truth just happening to look like the ones we've just sort of imagined on our own is at least as big of an assumption.