Everything that affects Mankind, is duly measured and destined

Allah reminds of His measuring and deciding the destiny of all things before He created the creation,

مَآ أَصَابَ مِن مُّصِيبَةٍ فِى الاٌّرْضِ وَلاَ فِى أَنفُسِكُمْ

Patience and Gratitude

لِّكَيْلَا تَأْسَوْا عَلَىٰ مَا فَاتَكُمْ وَلَا تَفْرَ‌حُوا بِمَا آتَاكُمْ (...so that you may neither grieve on what has escaped you, nor over-exult on what He has given you ...57:23) This means that Allah has informed us of His encompassing knowledge, recording all things before they occur and creating all things in due measure known to Him, so that we may know that what has met us would never have missed us, and what has missed us would never have met us. Therefore, we are commanded not to over-grieve on the good things we have missed, nor to over-exult on the comforts or wealth we enjoyed in this life, and in turn be neglectful about Allah and the Hereafter. Sayyidna ` Abdullah Ibn ` Abbas ؓ says that it is man's natural disposition that certain things cheer him up and other things make him miserable, whereas the true position should have been as follows: When any misery befalls him, he should endure it with patience and earn reward in the Hereafter, and when he experiences joy, he should experience it with gratitude to Allah and earn reward in the Hereafter. [ Reported by Hakim who rates it as sahib. See Ruh ]