Displeasure with evil and pleasure with good define a believer
Ṣifāt al-Shīʿa|Volume 1|Book 1|Chapter 44
وَ بِهَذَا اَلْإِسْنَادِ قَالَ قَالَ رَسُولُ اَللَّهِ ص مَنْ سَاءَتْهُ سَيِّئَةٌ وَ سَرَّتْهُ حَسَنَةٌ فَهُوَ مُؤْمِنٌ.
(The same previous series of relaters)… The Prophet صلى الله عليه وعلى آله وسلم said: He who is displeased by his evil deeds and pleased by his good deeds, then he is a believer.