Al-Hasan al-Basri (rahimahullaah) said:

I have not seen an oppressor who oppresses himself similar to an envious person! He (or she) is always frustrated; permanently sad and upon a distress that never comes to an end.

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[Source: Al-Aqd Al-Fareed’ of Ibn Abdi Rabbihi Al-Andaloosi (rahimahullaah)’ 2/170]