I've been thinking lately about the nature of one's "calling" and the task of finding purpose in life.
One of Os Guinness' insights in his book The Call is that the notion of "calling" is often understood and pursued as an end in itself rather than as a means to point beyond oneself. If there is no substance to the notion, the pursuit itself will never satiate the restlessness of a life devoid of ultimate purpose.
The notion of responsibility and talk of "callings" remain bafflingly hollow unless there is something or Someone to whom we are responsible, or response-able, to whom we are able to respond. There is no calling unless there is a Caller.—Os Guinness, The Call: Finding and Fulfilling the Central Purpose of Your Life, 19-20.