Hawzah News Agency – The commander of the faithful Imam Ali peace be upon him says:
مَن كاشَفَكَ في عَيبِكَ حَفِظَكَ في غَيبِكَ، مَن داهَنَكَ في عَيبِكَ عابَكَ في غَيبِكَ.
‘He who informs you of your faults will guard you in your absence, whereas he who flatters you with respect to your faults will point the finger at you in your absence.’
Source: Ghurar al-Hikam, no. 8260, 8261