Bertrand Russell said envy was one of the most potent causes of unhappiness. It is a universal and most unfortunate aspect of human nature because not only is the envious person rendered unhappy by his envy, but also wishes to inflict misfortune on others. Although envy is generally seen as something negative, Russell also believed that envy was a driving force behind the movement towards democracy and must be endured in order to achieve a more just social system.
envy is the pain or frustration caused by another person having something that one does not have oneself.
Kant defined envy as "a reluctance to see our own well-being overshadowed by another's because the standard we use to see how well off we are is not the intrinsic worth of our own well-being but how it compares with that of others"
Envy is one of the Seven deadly sins of the Christian Church.
In Islam, envy (Hassad in Arabic) can destroy one's good deeds. Therefore, one must be content with what God has given to them by saying Maashallah (God has willed it).