It was
narrated that Abu Hurairah said, attributing it to the Prophet
(ﷺ):
"The stronger believer is better and more beloved to Allah than
the
weak believer, although both are good. Strive to seek that which
will
benefit you and do not feel helpless. If something overwhelms
you,
then say: Qaddarallah, wa ma sha'a fa'al (It is the decree of
Allah and what He wills He does). And beware of (saying) 'If only,'
for 'If only' opens the door to Satan."
English reference: Vol. 5, Book 37, Hadith 4168
Arabic reference: Book 37, Hadith 4307