This is the worst trait of minds rendered arrogant by prosperity, they hate those whom they have injured.
Hoc habent pessimum animi magna fortuna insolentes: quos laeserunt et oderunt.
Original text (Latin)
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Notes from Wikiquote
De Ira (On Anger): Book 2, cap. 33, line 6
Variants
Men whose spirit has grown arrogant from the great favour of fortune have this most serious fault – those whom they have injured they also hate. (translation by John W. Basore) || Whom they have injured they also hate. (translator unknown).