James 4:13-15

13 Come now, you who say, "Today or tomorrow let's go into this city, and spend a year there, trade, and make a profit."  14 Whereas you don't know what your life will be like tomorrow. For what is your life? For you are a vapor, that appears for a little time, and then vanishes away.  15 For you ought to say, "If the Lord wills, we will both live, and do this or that."