Abu Hurairah (May Allah be pleased with him) reported: Messenger of Allah (PBUH) said, "A strong believer is better and dearer to Allah than a weak one, and both are good. Adhere to that which is beneficial for you. Keep asking Allah for help and do not refrain from it. If you are afflicted in any way, do not say: `If I had taken this or that step, it would have resulted into such and such,' but say only: `Allah so determined and did as He willed.' The word `if' opens the gates of satanic thoughts".
[Muslim].

Commentary:
1. In this Hadith, goodness is acknowledged in weak as well as strong because the real Faith is a common feature of both. The one who is stronger is, however, better with Allah for the reason that he is more active and energetic in the matter of noble deeds and performance of ritual prayers, obligatory as well as voluntary.

2. This Hadith ordains that in case of trouble, one should exercise patience and show submission and obedience rather than saying `ifs' and `buts' about it, because it provides Satan with a chance to mislead the sufferer.