وَجَعَلْنَا النَّهَارَ مَعَاشًا (11)
(78:11) and made the day to seek livelihood, *8
*8) That is, "The night has been made dark so that protected from light, you could enjoy a peaceful sleep- more easily and made the day bright for the reason that you could work for your livelihood with greater ease and facility. Reference has been made to only one benefit out of countless benefits of the continuous alternation of night and day regularly on the earth to tell that all this is not happening without a purpose or accidentally, but there is supreme wisdom underlying it, which has a deep connection with your own immediate interests. The darkness that was needed for the peace and rest of your body in view of its structure has been provided in the night and the light that was needed for earning livelihood has been provided in the day. This arrangement that has been made precisely in accordance with your needs by itself testifies that it could not be possible without the wisdom of a Wise Being." (For further explanation, see E.N. 65 of Yunus, E.N. 32 of Ya Sin, E.N. 85 of AI-Mu'min, E.N. 4 of Az-Zukhruf).