The Believer is always Grateful

Bismillah wal Hamdulillah wa Salat u wa Salam Ala Rasul Allah

Abu Yahya Suhaib bin Sinan reported that the Messenger of Allah said, "How wonderful is the case of a believer; there is good for him in everything and this applies only to a believer. If prosperity befalls him, he expresses gratitude to Allah and that is good for him; and if adversity befalls him, he endures it patiently and that is good for him."

[Muslim]

(Book: 100 Ahadith About Islamic Manners by Darussalam Publications)