The Unteachable Monkey

A troop of monkeys, badly chilled on a winter evening, spotted a firefly glowing in the darkness and mistook it for actual fire. Believing they had found warmth, they gathered dry grass and leaves around it and began huddling close, blowing on it and stretching out their limbs as if genuinely warming themselves.

A bird named Needle-Face, watching this from nearby, flew down to correct their mistake, explaining plainly and kindly that what they had found was merely a firefly, not fire at all, and that their efforts were pointless.

One especially chilly monkey, deeply invested in the comfort of believing he was getting warm, ignored her explanation entirely and kept blowing on the firefly. When Needle-Face persisted, coming closer and repeating her correction directly in his ear, the monkey's frustration boiled over.

Rather than reconsider his mistaken belief, he seized the well-meaning bird and dashed her against a rock, killing her instantly for the crime of being right and inconveniently persistent about it.

The tale is remembered as a blunt warning about the limits of good advice: no matter how correct or kindly delivered, well-meaning correction cannot help someone who has already decided, out of stubbornness or comfort, not to hear it -- and pressing the point past a certain limit can turn a merely unteachable listener into a dangerous one.