All obstacles come into existence because Allah wills a good for believers. If people are to understand this submission fully, they must take Allah as their sole Friend and Protector and turn to Him the Almighty in complete sincerity. A most telling characteristic of the morality that Allah wills for believers is that they do not become sad or negative or fall into despair, no matter what they may encounter.
Hopelessness indicates disbelief or weak faith, and is a consequence of one’s failure to comprehend that everything takes place according to destiny. Allah draws our attention to this error, for under despair lies a mood and rationale opposed to the very values of the Qur’an. Such an attitude is forbidden, because Allah advises people to trust in Him, be hopeful, and see good in all that happens.
Audiobook - Faith: The Way To Happiness 

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