Almighty ALLAH blesses us with all His gifts. The Sun gives us light during the day to help us see and it helps our crops grow so that we can eat. But the Sun also teaches us other things.
Almighty ALLAH causes the day to die with its setting and allows the night to take over, which is a time for rest. In this way, He may be showing us that all of us will eventually have to die just like the day. And when the Sun rises in the morning again after our period of rest, it is as if Almighty ALLAH is telling us that we too will be raised to life after we have died. These are all signs of Almighty ALLAH to teach us to take care of our life.
One thing that we must remember is that death is inevitable, and everything except the Almighty ALLAH of course, will perish. Signs of death can be seen all around us. At funerals we see people who were once walking among us being buried in their graves. In the fall we see the leaves turn from green to yellow and fall one at a time, and in the winter we see trees, lifeless. In this way, all things in this world will wither away and die.