The task of figuring out one's purpose in life has so much more to it, however, than ambition. Many people, especially in today's economy, would be very fulfilled just knowing that they can do a good day's work, get paid for it, and keep a roof over their family's heads. For many people, finding their life's work or their inner calling has to wait until more prosperous times, when opportunities are more plentiful.
There are also other ways to be fulfilled, if a person has a job that's not ideal but wants to keep it. By volunteering, taking a class, or just learning one new skill, life can seem fresh and important. And goals don't have to be about the workplace: A goal might be to save money for a trip to a place you've always wanted to visit, to achieve a certain level of physical fitness or to start a journal.
There are also books and websites that help a person hone in on their aptitudes and consider how to use those interests in their work life:
Wishcraft, by Barbara Sher (a great website with free downloads from the book):
What Color is your Parachute, by Dick Bolles:
Do What You Love, The Money Will Follow By Marsha Sinetar, Ph.D