12. It is narrated from him from his father from ibn Sinan from those whom he has mentioned from Abu ‘Abdillah (a.s.) who has said the following
“I (the narrator) asked him, (Abu ‘Abd Allah (a.s.)), ‘By what means can a believer know that he is a believer?’ The Imam said, ‘(He can find out) by means of his submitting himself to Allah, and being satisfied with whatever happiness or sadness that he may experience.’”