What do the existentialists say about holding ridiculous beliefs, given they don't change your behaviour? I know that Sartre might consider highly self important beliefs inauthentic, but wondered what it mattered if they were quarantined, so to speak.

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    I suspect that existentialists would be sympathetic to Bain's definition of belief as "that upon which a man is prepared to act". Sartre specifically talks about "committing" to your beliefs, and "creating meaning" through action. In other words, if they don't change your behavior they are not really your beliefs. There is no quarantine. – Conifold Sep 26 '17 at 20:56
  • @Conifold good answer, if somewhat over anticipated. so you would call them, what, meglomaniacal fantasies? – user28660 Sep 26 '17 at 21:30