Thematic Bible: Presuming upon unchanging conditions

Come, you who say, "To-day or to-morrow we will go to this or that city, and spend a year there and carry on a successful business," when, all the while, you do not even know what will happen to-morrow. For what is the nature of your life? Why, it is but a mist, which appears for a short time and then is seen no more.