Hawzah News Agency – Prophet Jesus (AS) when asked about the traits of the fool said,

المُعجَبُ برأيهِ ونَفْسِهِ، الّذي يَرى‏ الفَضلَ كُلَّهُ لَه لا علَيهِ، ويُوجِبُ الحقَّ كُلَّهُ لنَفْسِهِ ولا يُوجِبُ علَيها حقّاً، فذاكَ الأحمَقُ الّذي لا حِيلةَ في مُداواتِه.

'He is one who is proud of himself and his own opinion, who sees all good traits as coming from himself and sees no one better than himself, who has decided that all rights are his and others have no right over him, so this is the fool for whom there is no cure for his disease.'

Source: al-Ikhtisas, p. 221