The most recent issue of Writer’s Digest features great advice specifically focusing on novelists and novel writing. I suggest you pick it up immediately. The quotation in the title is from Doris Lessing.
Some other great quotes:
“There is only one plot – things are not as they seem.” – Jim Thompson
“A book comes and says, ‘Write me.'” – Madeleine L’Engle
“I always start writing with a clean piece of paper and a dirty mind.” – Patrick Dennis
“Do not hoard what seems good for a later place in the book, or for another book; give it, give it all, give it now.” – Annie Dillard