Few insights outside conceptual thought are complicated. Most insights are so simple you can "understand" them and still fail to get it.
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"Yes, of course death is nothing to be afraid of. I know I'm going to die." - a person who spends life in a state of near-constant anxiety
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"Yes, of course it's pointless to think too much. Live in the moment." - someone whose inner thoughts are relentless and self-critical
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Just because you understand something intellectually doesn't mean you *know* it in any sense worth mentioning.