Every motivational book I have ever read expounds the virtues of positive thinking. Few however, really push taking the time to deliberately think. Yet taking time to think positively is one of the most critical things you can do.
And what should you think about? How about your goal? What is it you want from your career? What is it you want in life? What do you want bad enough that you actually willing to work for?
Have you spent enough time thinking about what the new opportunity can do for you? Think about it!