...words are in a way our godly sharing in the work of creation, and the speaking and writing of words is at once the most human and the most holy business we engage in.
By and large a good rule for finding out is this: the kind of work God usually calls you to is the kind of work a) that you need most to do and b) the world most needs to have done. If you really get a kick out of your work, you've presumably met requirement a), but if your work is writing TV deodorant commercials, the chances are you've missed requirement b).
What makes me a believer is that from time to time, going back almost as far as my memory will go back, there have been glimpses I've had. Sometimes literally a glimpse which made me suspect the presence of something extraordinary and beyond the realm of the immediate. That's what I think a lot of what my writing has been, my preaching has been - trying to listen to that voice again, to see those moments again.
Preaching and writing - it's the same. Whether I'm writing to speak or writing to be read in a book, it's the same thing.