James warns against the pride of presumption in speaking of the simplest plans in life without a due submission to the over-arching sovereignty of God over the day’s agenda. Man’s plans might be interrupted by God’s decision to take the life he gave. Instead of saying, “‘Today or tomorrow we will go into such and such a town and spend a year there and trade and make a profit’ . . . you ought to say, ‘If the Lord wills , we will live and do this or that’” (James 4:13–15).
From the book "Does God Desire All to Be Saved?"