Inspiration exists, but it has to find you working.
I love this quote from Pablo Picasso. On the one hand, it gives me hope — if only I am diligent about practicing my writing, inspiration will find me.
On the other hand, it encapsulates what I am coming to believe about writing. It is important to work at your craft, regardless of whether the Muse has graced you with her presence. Daily (or otherwise regular) practice of writing will lead to creativity; it will find you if only you are working.
Now I just need to carve out a little more time to write, and inspiration will track me down!