Part IIa IIaeCharityQuestion 36
Envy
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Envy is sorrow or sadness over another’s good,because that good is regarded as something withheld or taken awayfrom the envious person’s excellence or reputation.
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Envy is a sin; it grieves over what charity findscapable of causing joy; it is a spiritual disorder.
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Envy in its kind (or genus) is a mortal sin, for it isin conflict with the precept of charity. But in the envious personthe sin of envy is mortal only when it is committed with fullknowledge and full consent.
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Envy is a fruitful source of other sins, and thereforeit is listed with the capital sins.
Full Summa Text · II-II, Q. 36
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