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

أعقَلُ النّاسِ مَن كانَ بِعَيبِهِ بَصيراً، وعَن عَيبِ غَيرِهِ ضَريراً.

‘The most intelligent of people is he who is well aware of his own faults and blind to others’ faults.’

Source: Ghurar al-Hikam, no. 3233