This poem reads to me like a writer writing of writer's block. But done very well.
The first stanza is expressing how writing and words came easily to the writer in the past and since the past tense "used" is used, it foreshadows the second stanza.
The second stanza I have more trouble with. When I read it, I think the author is suggesting that since words/writing doesn't come as easily in the present/now that the best choice is to just stop?
Or, that rather than make oneself write, just sit back and allow the thoughts/words/ideas to flow to oneself. Which, to me, fits with the idea of letting the universe create itself in the last two lines.
Relating writing to god (metaphor for creator) is a bit cliché, but I think you do it well in this piece.
I haven't read Stephen King, but I do agree with Sir Bongatron that this could very easily be an introductory poem to a chapter or character. In fact, this poem of yours just gave me an idea. For that, I have to say thank you very much for writing this. (Did you think this poem would be inspiring?)
This is an amazing poem. It's short and simple, but full of thought provoking elements, and I even see it as motivation. If you've ever read Stephen King he has poems at the front of most of his chapters, and this is just as good if not better than those. Thought provoking, open and touching. Keep writing :)