In their response to calamities, people fall into many ranks

Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) said: In their response to calamities, people fall into many ranks:

1. One who is grateful
2. One who shows acceptance and contentment
3. One who is patient
4. One who panics.

As for the one who panics, he is doing something that is prohibited and is expressing discontent with the decree of the Lord of the Worlds, in Whose hand is the sovereignty of the heavens and the earth, His is the dominion and He does whatever He wills.

As for the one who is patient, he is doing that which is obligatory. The one who is patient is the one who puts up with calamity. In other words, he finds it bitter and difficult and hard, and he dislikes it befalling him, but he puts up with it and restrains himself from saying or doing anything that is prohibited. This is what is obligatory.

As for the one who shows acceptance and contentment, he is the one who does not worry about this calamity, for he sees that it is from Allah, so he accepts it with complete acceptance and feels no sorrow or regret in his heart, because he is completely content. His situation is better than that of the one who is merely patient.

As for the one who is grateful, he gives thanks to Allah for this calamity. But how can he give thanks to Allah for this calamity, when it is a calamity? The answer is twofold:

Firstly, he looks at those who are afflicted with a greater calamity, and he gives thanks to Allah that he has not been afflicted with such a level of calamity.

Secondly, he realises that this calamity has befallen him as expiation for his bad deeds and to raise him in status, if he is patient, and what awaits him in the hereafter is better than what is in this world, so he gives thanks to Allah. Moreover, those who are most sorely tested among the people are Prophets, then the righteous, then the next best, then the next best. So he hopes that he is one of the righteous, and he gives thanks to Allah, may He be glorified and exalted, for this blessing.

Giving thanks for calamities is mustahabb, because it is superior to acceptance, for gratitude includes acceptance and more.

End quote from ash-Sharh al-Mumti‘ (5/395-396)

So according to this thread Allah is the source of calamity, then what is the job of Shaitan?