38. The word yanaabi in the text is comprehensive and applies to all the three sources of water.
39. That is, a man of understanding learns this lesson from it that the life of this world and its adornments are all transitory. The end of every spring is autumn. The fate of every youth is weakness and death. And every rise has a fall. Therefore, this world is not something of which one should be charmed and enamored so as to forget God and the Hereafter and should conduct himself here in a manner as to ruin his Hereafter, only for the sake of enjoying the short lived pleasures of this world. Then a man of understanding also learns this lesson from these phenomena that the spring and autumn of this world are only under Allah’s control. Allah allows to grow and prosper whomsoever He wills and ruins and lays waste whomsoever He wills. Neither it is in anybody’s power to stop the growth of someone whom Allah wills to grow, nor has anyone the power to save him from destruction whom Allah wills to destroy.