And We made the night and the day as two signs indicating Our uniqueness and Our power, so We erased the sign of the night-which is the moon-and We made the sign of the day-which is the sun-radiant; so that the human sees in the light of the day how he disposes in the affairs of his livelihood, and stays in the night for residence and rest, and so that the people know-from the alternation of the night and the day-the number of years and the reckoning of months and days, so they arrange upon them what they wish of their interests. And everything We have clarified with a sufficient clarification.