Once a novel gets going and I know it is viable, I don't then worry about plot or themes. These things will come in almost automatically because the characters are now pulling the story.
Chinua AchebeWhen I began going to school and learned to read, I encountered stories of other people and other lands. In one of my essays, I remember the kind of things that fascinated me. Weird things, even, about a wizard who lived in Africa and went to China to find a lamp... Fascinating to me because they were about things remote, and almost ethereal.
Chinua Achebe