Being Patient during dificulties

Surah-e-Baqara, verse 156:
الَّذِينَ إِذَا أَصَابَتْهُم مُّصِيبَةٌ قَالُواْ إِنَّا لِلّهِ وَإِنَّـا إِلَيْهِ رَاجِعونَ
Who say, when afflicted with calamity: "To Allah We belong, and to Him is our return".
According to Imam Ali (a.s.), ‘To Allah we belong (inna lillahe) means that we are His property and ‘and to His is our return (wa inna elahay rajeoon)’ means that we will cease to live.
What are those calamities that when afflicted with, they say this. Are these just the misfortune of death or more? When we read the previous verses that say,
O ye who believe! Seek help with patient perseverance and prayer; for Allah is with those who patiently persevere.
And say not of those who are slain in the way of Allah: "They are dead." Nay, they are living, though ye perceive (it) not.
Be sure we shall test you with something of fear and hunger, some loss in goods or lives or the fruits (of your toil), but give glad tidings to those who patiently persevere,


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