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This interpolation - necessary for a proper understanding of the context - is based on Razi's convincing explanation of how this passage connects with the preceding one. Man is, as a rule, absorbed in a pursuit of material goods and comforts, the achievement of which he identifies with "happiness"; hence, he pays but scant attention to spiritual aims and values, and the more so if he is called upon to abandon his selfish pursuits in favour of the - to him as yet hypothetical - life in the hereafter.
I.e., instead of remembering his past happiness with gratitude, he calls the very existence of God in question, arguing that if God did really exist, He "could not possibly have permitted" so much misfortune and unhappiness to prevail in the world: a fallacious argument inasmuch as it does not take the reality of the hereafter into account and is, moreover, based on a concept of God in terms of purely human feelings and expectations.
I.e., when God bestows on him a measure of material benefits, man tends to exult in this "success" as such, attributing it exclusively to his own ability and cleverness (cf. the first sentence of 41:50
They totally deny previous favours.
They totally deny previous favours.
The warning is now given, that men may repent and do good, and pray for Allah's Mercy and Grace. If the warning is not heeded or is rejected, the prophet of Allah is not responsible for bringing about the Penalty or for forcing people to come to the right Path. He is not a guard set over them to free them from the need of exercising their limited free-will.
Cf. xxx. 36. It is a sad reflection that men, when they receive some gift out of Allah's Mercy, exult in their good fortune and attribute it to some merit in themselves, instead of to the Grace and Mercy of Allah, thus missing the real lesson of Life. On the other hand, when they are in trouble, due to their own errors and shortcomings, they fall into despair and blame Allah, instead of blaming themselves. This is rank ingratitude. So they miss the true lesson of Life in that case also.