إِذَا سَرَّتْكَ حَسَنَتُكَ، وَسَاءَتْكَ سَيِّئَتُكَ، فَأَنْتَ مُؤْمِنٌ
Translation: If your good deed makes you glad and your bad deed troubles you, then you are a believer.
Source: أحمد
سَرَّتْكَ means “made you happy,” whereas سَاءَتْكَ means “distressed you.” In both expressions, كَ addresses “you”; حَسَنَتُكَ means “your good deed” and سَيِّئَتُكَ “your bad deed.” The response is فَأَنْتَ مُؤْمِنٌ.
A morally responsive believer feels grateful for doing good and remorseful when doing wrong. The standard is not simply public approval but an active conscience shaped by faith. Feelings must also lead to correcting wrongful conduct.