Imam As-Sadiq (a.s.) said:
سِتَّةٌ لا تَكُونُ فِى مُؤْمِن: اَلْعُسْرُ وَ النَّكْدُ وَ الْحَسَدُ وَ الْلَّجاجَةُ وَ الْكِذْبُ وَ الْبَغْىُ
There are six things which do not exist in the believers: strictness, peevishness, envy, stubbornness, lies and injustice.1
Those who are satisfied with being believers in name only are not real believers. The six ugly attributes specified above should not exist in a true believer. It is interesting to note that all these attributes are concerned with mutual relations and social interactions among the people. True believers are good natured , benevolent, truthful and just and it does not behoove those lacking such character to call themselves believers .