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There's a spectrum, obviously, just as there's a spectrum to the extent we can change our talents. All I'm saying is that belief isn't 100% externally imparted and our choices do have some influence. And perhaps insanity is just the extreme end of that spectrum.
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How much success do you think you could have in believing that you could breathe underwater, or teleport, or control the weather with the power of your mind? Not using some trick or technicality (e.g., "the power of SCUBA allows me to breathe underwater!" or "one day humans will build technology to allow weather control, and brain-computer interactions are already a thing") but in a reasonable and contemporary context?
If one managed to believe in the examples I gave, it would be tantamount to giving oneself mental illness. Which is what @ek's examples demonstrated, where the desire to believe was so overwhelming that the mind snapped. Is that what you mean?