If I waited to be in the mood to write, I'd barely have a chapbook of material to my name. Who would ever be in the mood to write? Do marathon runners get in the mood to run? Do teachers wake up with the urge to lecture? I don't know, but I doubt it. My guess is that it's the very act that is generative. The doing of the thing that makes possible the desire for it.
Still Writing: The Perils and Pleasures of a Creative Life (ed. 2013)