وَلَا تَسْتَوِي الْحَسَنَةُ وَلَا السَّيِّئَةُ إدْفَعْ بِالَّتِي هِيَ أَحْسَنُ فَإِذَا الَّذِي بَيْنَكَ وَبَيْنَهُ عَدَاوَةٌ كَأَنَّهُ وَلِيٌّ حَمِيمٌ وَمَا يُلَقَّاهَا إِلَّا الَّذِينَ صَبَرُوا وَمَا يُلَقَّاهَا إِلَّا ذُو حَظٍّ عَظِيمٍ  (41: 33-36)

Good and evil are not equal. Avenge evil with good, and he with whom you have enmity will become your dearest friend. And none will attain this [wisdom] except those who are patient and none will attain it except the very fortunate. (41:33-36)