An insane person is a genius that can’t put their unbelievable insights into words – because the insights are actually beyond words.
But the genius still tries to explain to the sleepers how reality actually works. Their efforts are in vain though because to the regular joe – it’s all nonsense anyway.
An insane person is actually the most sane person of all, but the average person doesn’t have the capacity to comprehend them.
Therefore they get labeled insane.