And Ayyub, when he called out to his Lord: “Great harm has afflicted me, and You are the Most Merciful of the merciful. ” (Surat al-Anbiya', 21:83)
As is the case with all other beings, we also exist in a state of need. Our existence depends on many conditions: oxygen to breathe, water and nutrients for our bodies' physical functions, for example. The list is endless, for an infinite number of details are essential for maintaining each person's physical existence.
However, all people can survive without giving much thought to meeting their needs. Everything they need for their bodies and their survival has already been provided and put to use. The first example that comes to mind is breathing. Oxygen is essential for survival, but who provides the right ratio of oxygen in the atmosphere? Or, who places the system that takes in this oxygen and processes it so that it can be conveyed to each cell? None of these can be attributed to anyone, for no one has any part in forming the atmosphere or one's respiration system.
This vital need being the foremost, every detail is designed in its most perfect and feasible form. At this point, we encounter a superior wisdom that designs all details and the infinite compassion that the Owner of this wisdom—Allah, the Most Merciful—shows to us.
Allah's mercy is not limited to meeting people's physical needs. Allah created people, placed them in the most suitable place, and, in return, only asked them to serve Him. He also told people how to do this and sent down books and Prophets for this very purpose. This way, Allah made Himself known and called them to religion and moral excellence. These are obvious signs of our Lord's infinite mercy.
