jealousy
jealousy
Old French
“Jealousy and zeal are the same word — both come from Greek zelos, which meant fervent passion, devotion, even holy ardor. The emotion that destroys relationships began as a word for spiritual intensity.”
Greek zēlos meant fervent desire, eagerness, jealous rivalry, or zealous emulation. The Septuagint — the Greek translation of the Hebrew Bible — used zēlos to translate the Hebrew qin'ah, which described the burning intensity of divine jealousy: 'For I the Lord your God am a jealous God.' The word carried that sacred fire into Christian theological language.
From Greek, zēlos entered Latin as zelus and Old French as gelos or jalous. The Old French jalousie also named the louvered window shutter — the jalousie window — because jealous people spy through half-open shutters. The furniture and the emotion share the etymology: both are about watching from concealment.
Medieval French distinguished between two kinds of jealousy: the noble version (emulation, striving to match excellence) and the base version (envy of another's advantage). English jealous retained both senses until the 18th century, when jealousy shifted primarily to the sexual-possessiveness sense and envy to the covetous sense. The split was never clean.
Evolutionary psychologists argue that sexual jealousy evolved as a reproductive strategy — guarding one's mate protects investment in offspring. Men and women differ slightly in triggers: men respond more intensely to sexual infidelity; women more intensely to emotional infidelity. The Greek word that began as holy zeal became, in evolutionary terms, a survival mechanism.
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Today
Jealousy is the feeling that something you possess — a person's affection, a position, a reputation — might be taken by another. It differs from envy: envy wants what someone else has; jealousy fears losing what one already has. The green-eyed monster guards, rather than covets.
The Greek zēlos that began as holy ardor became the emotion that makes people spy through louvered shutters. Sacred fire, pointed inward, becomes consuming. The zeal and the jealousy were always the same thing — intensity without a worthy object.
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