Hawzah News Agency – The commander of the faithful, Imam Ali peace be upon him says:

أحمَقُ النّاسِ مَن ظَنَّ أنّهُ أعْقَلُ النّاسِ.

'The most foolish of people is the one who thinks that he is the most intelligent.'

Source: Ghurar al-Hikam, no. 3089