https://www.dhammatalks.org/suttas/MN/MN75.html
“Māgaṇḍiya, suppose that there was a leper covered with sores & infections, chewed up by worms, picking the scabs off the openings of his wounds with his nails, cauterizing his body over a pit of glowing embers. His friends, companions, & relatives would take him to a doctor. The doctor would concoct medicine for him, and thanks to the medicine he would be cured of his leprosy: well & happy, free, master of himself, going wherever he liked. Then suppose two strong men, having seized hold of him by both arms, were to drag him to a pit of glowing embers. What do you think? Wouldn’t he twist his body this way & that?”
“Yes, Master Gotama. Why is that? Because the fire is painful to the touch, very hot & scorching.”
“But what do you think, Māgaṇḍiya? Is the fire painful to the touch, very hot & scorching, only now, or was it also that way before?”
“Both now & before is it painful to the touch, very hot & scorching, Master Gotama. It’s just that when the man was a leper covered with sores & infections, chewed up by worms, picking the scabs off the openings of his wounds with his nails, his faculties were impaired, which was why, even though the fire was actually painful to the touch, he had the skewed perception of ‘pleasant.’”
“In the same way, Māgaṇḍiya, sensualities in the past were painful to the touch, very hot & scorching; sensualities in the future will be painful to the touch, very hot & scorching; sensualities at present are painful to the touch, very hot & scorching; but when beings are not free from passion for sensualities—chewed up by sensual craving, burning with sensual fever—their faculties are impaired, which is why, even though sensualities are actually painful to the touch, they have the skewed perception of ‘pleasant.’
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