If this trouble had not befallen them...
If this trouble had not befallen them, the would have continued to look upon themselves as gods, to spend their lives in conceit, to have no pity or sympathy with anybody else. Would such conduct have been in the interests of their religion and this world? Certainly not! Along with defective religion, they would have suffered worldly harm. People would have hated them and condemned them.
Such selfish persons would have created disorder in this universe in all affairs, industry, commerce, knowledge and mutual conduct etc. People who deny these matters, looking upon them as meaningless, are like those children who condemn bitter and unpalatable medicine and get offended at the precautions against harmful foods. They dislike work, and like only to play freely, indulge in absurdities, to eat and drink without let or hindrance.
They do not know that such license and idleness would deteriorate their mental, moral and physical growth, that these palatable but harmful edibles would lead to different ailments and diseases. Their betterment lies in acquiring knowledge, and medicines hold many benefits for them despite a little unpalatableness. They say as to why men have not been given sinless conduct so that the Almighty Allah may not have needed to pinch them with troubles.
The answer to them will be that in that case man would not have been worthy of any credit for goodness nor entitled to reward therefore. If they further say that being allowed every sort of pleasure and comfort, where did any harm lie if he did not win credit or reward by virtue of his goodness? The answer will be to present this proposition to a rational and healthy person telling him to sit on idly, assuring him of the fulfilment of all his needs without any efforts.
Then see if his mind agrees to it. You will find him far better pleased and satisfied with the little he gets by his own effort rather than a great lot which comes to him unearned, without effort. Similarly the blessings of the Hereafter will be congenial to them only when they are earned through effort. Man is therefore allowed a two-fold boon. Firstly, he gets a great reward for his effort in this world.
Secondly, he has been shown the way to seek it by his own effort so as to get the maximum satisfaction for achievement. It is quite natural for a man to allow no worth to anything obtained without effort or title. On the contrary, whatever he gets as a result of effort and little, he sets great store by it.