There is good for a Believer in everything:
بسم الله والحمد لله والصلاة والسلام على رسول الله ، وبعد
27. Abu Yahya Suhaib bin Sinaan رضي الله عنه reported that the Messenger of Allaah ﷺ said:
❝How wonderful is the case of a believer; for all his affairs are good for him, and this applies only to a believer. If something good happens to him, he is thankful for it and that is good for him; if something bad happens to him, he bears it with patience and that is good for him.❞
[Saheeh Muslim (7138), Kitaab al-Zuhd]
Shaikh Ibn al-`Uthaymeen رحمه الله said:
The author (Imaam al-Nawawee) رحمه الله mentioned the Hadeeth of Suhaib al-Roomee that the Prophet صلى الله عليه وسلم said: ❝How wonderful is the case of a believer; there is good for him in everything…❞, meaning: the Prophet صلى الله عليه وسلم expressed his amazement in a good way; ❝…for the case of a believer…❞, meaning: the affairs concerning a Believer. All the affairs concerning a Believer are only good for him, and this is not applicable to anyone except a Believer.