"Look here, you who say, 'Today or tomorrow we are going to a certain town and will stay there a year. We will do business and make a profit.' How do you know what your life will be like tomorrow? Your life is like the morning fog... it's here a little while, then it's gone. What you ought to say is, 'If they Lord wants us to, we wil live and do this or that.' Otherwise, you are boasting about your own plans, and all such boasting is complete evil."
-- James 4:13-16