What? You mean it's not healthy to believe five mutually contradictory things before breakfast?
or are you referring to Double Think?Doublethink is the act of simultaneously accepting two mutually contradictory beliefs as correct, ... But this contradiction is a living thing and wholly reflects the Marxist dialectic. ... contradictory and believing in both of them, to use logic against logic, to repudiate morality while laying claim to it, to believe that democracy was ...https://en.wikipedia.org/wiki/Doublethink

Here you go.
https://en.wikipedia.org/wiki/Cognitive_dissonance
You are correct. CD causes insanity.