From Michael Cunningham – The Hours. One of my favourite novels ever.

““This morning she may penetrate the obfuscation, the clogged pipes to reach the gold. She can feel it inside her, an all but indescribable second self, or a parallel, purer self. If she were religious, she would call it the soul. 
It is more than the sum of her intellect and her emotions, more than the sum of her experiences, though it runs like veins of brilliant metal through all three. It is an inner faculty that recognizes the animating mysteries of the world because it is made of the same substance, and when she is very fortunate she is able to write directly through that faculty. Writing in that state is the most profound satisfaction she knows, but her access to it comes and goes without warning. She may pick up her pen and follow it with her hand as it moves across the paper; she may pick up her pen and find that she’s merely herself, a woman in a housecoat holding a pen, afraid and uncertain, only mildly competent, with no idea about where to begin or what to write.”