Hawzah News Agency – the merciful prophet of Islam says:

ثَلاثٌ مَن لَم يَكُن فِيه لِمَ يَتِمَّ لَهُ عَمَلٌ: وَرَعٌ يَحجُزُهُ عَن مَعاصِي اللَّهِ، وخُلُقٌ يُدارِي بِهِ النّاسَ، وحِلْمٌ يَرُدُّ بِهِ جَهلَ الجاهِلِ.

'There are three things that if are not present with someone then their actions are incomplete: piety preventing one from disobeying Allah, a character through which one is amicable towards people, and clemency with which to deal with the rashness of the ignorant.'                        

Source: Al-kafi. v. 2, p. 116, no. 1