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Imam Sadegh (P.B.U.H ) - one of the Islam's leader after Prophet Muhammad- says:

an envious person sustains a loss to himself before causing a loss to whom he envies.

bihar-ul- anwar, volume 73, page 255

brief description
the spirit of envy refers to not tolerating the others having a blessing, and trying to deprive them from that blessing, or causing a loss to them in other ways.
in fact, an envious person always activates as a retardation factor not a developmental factor.
envy is a big moral disease and in psychological view, the jealous person suffers more loss and also is melted, retarded and humiliated more than others. thus it is better that he try for precedence instead of causing others to be retarded.

قال الصادق عليه السلام

الحاسِدُ مُضِرُّ بِنَفْسِهِ قَبْلَ أَنْ يُضُرّ بِالَْمحْسُودِ

انسان حسود قبل از انکه به آنکه نسبت به او حسد ورزيده ضرر بزند، به خودش آسيب مي رساند