Most believe that not knowing will drive you mad. But really learning the truth can make you just as crazy.
It's a different kind of psychotic, yes. But insane nonetheless.
There are secrets secrets to this world that a meager human mind should not learn should not have to hold.
Sometimes those fiendly deities slip up. They leave a door open a window cracked and suddenly! a human knows too much.
There are consequences, of course. The natural order will always be restored, in due time. But alas, it is not the clumsy god who is punished, no, if only it worked that way. No, as it has been since humans first walked, the poor mortal man must be punished for learning listening when he ought not to.
And that's where the madness of knowing comes in. As punishment for the deities' wrongdoings. The natural order is restored by erasing the man's sanity. And once it is gone, it is impossible to retrieve.
So be careful, little mortal, when you wish in the well for infinite knowledge, you never know what mischievous god may be listening.