Hawzah News Agency – Imam al-Sadiq peace be upon him says:  

اليَأسُ مِمّا في أيدي النّاسِ عِزٌّ لِلمُؤمنِ في دِينِهِ.

'Despair of what other people possess is dignity for the believer in his religion.'

Source: Wasa'il al-Shia, v. 6, p. 314, no. 5