Worldly life may be compared to water We send down from the sky. It mingles with the plants of the earth on which mankind and livestock feed until, when the earth takes on its trimmings and looks attractive, and its people think that they will be able to use them as they like, Our command comes along to it by night or daytime, and We mow it down ahead of time just as though it had not been so lush the day before. Thus We spell out signs for folk who will think things over.