Quotes about Writing

'A page at a time, a day at a time, is the way we must live our writing lives. Credibility lies in the act of writing. That is where the dignity is. That is where the final "credit" must come from.'
- Julia Cameron
"The Right to Write"

"Start with a good sharp beginning. Plunge into your story so that the reader is in no doubt what it is going to be about. Give your chapters cliffhanger endings, which you may prefer to call hooks. Whatever you call them, intrigue readers enough so that they feel compelled to read on. Get started. Above all, be passionately interested in the story youre going to tell. "
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Successful Novel Plotting (Secrets to Success Writing Series) (Jean Saunders)

Not specifically about writing:

Don't listen to your peers. Don't listen to your -- the authority figures in your life -- your parents... And don't listen to the culture. Only listen to yourself. That's where you're going to find the truth... Trust your feelings... People ask me, 'well, how do you know what your passion is?' I say, well, when you sit down to do something at 7 o'clock in the morning, you get hungry and you go get something to eat, and you realize it's 7 o'clock at night. That's your passion. That's what you love. Find something around that that you can make your career. Because the idea of becoming famous, the idea of being powerful, is, in essence, meaningless. It's only that you're happy. And you're only going to be happy doing what you love.
~ George Lucas

A link to a bunch of good ones -- check the comments too.

http://www.writersdigest.com/editor-blogs/there-are-no-rules/72-of-the-best-quotes-about-writing?et_mid=564411&rid=233044797