Allah tells us about the weakness that is inherent in man, except for those whom He protects at both times of ease and calamity. If Allah blesses a man with wealth, good health, ease, provision and help, and he gets what he wants, he turns away from the obedience and worship of Allah, and becomes arrogant. Mujahid said, "(It means) he goes away from Us." I say, this is like the Ayah:

{But when We have removed his harm from him, he passes on as if he had never invoked Us for a harm that touched him!} (10:12) and;

When man is stricken with evil, which means disasters, accidents and calamities.

{he is in great despair.}, meaning that he thinks he will never have anything good again. As Allah says,

{And if We give man a taste of mercy from Us, and remove it from him, verily, He is despairing, ungrateful. But if We let him taste good after evil has touched him, he is sure to say: "Ills have departed from me." Surely, he is exultant, and boastful. Except those who show patience and do righteous good deeds: those, theirs will be forgiveness and a great reward.} (11:9-11)

Ibn 'Abbas said, "According to his inclinations." Mujahid said, "According to his inclinations and his nature." Qatadah said, "According to his intentions." Ibn Zayd said, "According to his religion." All these suggestions are close in meaning. This Ayah - and Allah knows best - is a threat and a warning to the idolaters, like the Ayah:

{And say to those who do not believe: "Act according to your ability and way"} (11:121)

So Allah says:

meaning either us or you. Everyone will be rewarded in accordance with his deeds, for nothing whatsoever is hidden from Allah.