For curiosity desires to know what is hidden and secret; but no one conceals his good fortune, nay sometimes people even pretend to have such advantages as they do not really possess. So the curious man, eager to hear a history of what is bad, is possessed by the passion of malignity, which is brother to envy and jealousy.
 Plutarch, Moralia (c. 100 AD). copy citation

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Author Plutarch
Source Moralia
Topic curiosity jealousy
Date c. 100 AD
Language English
Reference
Note Translated by Arthur Richard Shilleto
Weblink http://www.gutenberg.org/files/23639/23639-h/23639-h.htm

Context

“or rather, as cities have certain ominous and gloomy gates, through which they conduct only condemned criminals, or convey filth and night soil, for nothing pure or holy has either ingress into or egress from them, so into the ears of curious people goes nothing good or elegant, but tales of murders travel and lodge there, wafting a whiff of unholy and obscene narrations. "And ever in my house is heard alone The sound of wailing;" this is to the curious their one Muse and Siren, this the sweetest note they can hear. For curiosity desires to know what is hidden and secret; but no one conceals his good fortune, nay sometimes people even pretend to have such advantages as they do not really possess. So the curious man, eager to hear a history of what is bad, is possessed by the passion of malignity, which is brother to envy and jealousy. For envy is pain at another's blessings, and malignity is joy at another's misfortunes: and both proceed from the same savage and brutish vice, ill-nature. 244§ vii. But so unpleasant is it to everybody to have his private ills brought to light, that many have died rather than acquaint the doctors with their secret ailments.” source