Abu Huraira (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings of Allah be upon him) said: "A strong believer is better and more beloved to Allah than a weak believer, though there is good in all (the believers). So strive for that which benefits you, seek help from Allah, and do not be helpless or lazy. And if any harm befalls you, do not say: If I had done (such and such), then (such and such) would have happened; rather say: Allah decreed (this), and whatever He willed, He did. For indeed, the word 'if' opens the deeds of Satan." Narrated by Muslim.