“The strong believer is better and more beloved to Allah than the weak believer, although both are good. Strive to seek that which will benefit you, keep asking Allah for help 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 he did what he willed). beware of (saying) ‘If only,’ for ‘If only’ opens the door to Satan.”
It was narrated that Abu Hurairah, may Allah be pleased with him, said, attributing it to the Prophet (may the peace and blessings of Allah be upon him):
