Day and night 2

In the Quran when Allah states night and day, He expresses different modes of day and night ( He causes the night to enter the day and the day enter to night or He wraps the day over the night,  and it also  stated: " We have made the night and day two signs, and We erased the sign of the night and made the sign of the day visible.. ...) there is no word in the Quran like the word of night and day. 

In sura Ya_seen says that night and day are like a skin that is separated from the fruit.  For example,  the life of a man is seventy years old and every night and the day goes by his life .it is like a skin is peeled from a fruit to reach the end.  It is as if every human being is the creature of night and day and had nothing but day and night. 

It is enough to know the believer from the disbeliever to ask about the last night and day of their life ( how they have passed it)  until you find out the value of their entire life. 

Everything man does to be equal to his day and night.  The continuity of night and day is enormous object and represents the gravity of the act.  Night and day creates fate .