"For a long time now I have tried simply to write the best I can. Sometimes I have good luck and write better than I can." (Ernest Hemingway)
"No passion in the world is equal to the passion to alter someone else's draft." (HG Wells)
"Substitute 'damn' every time you're inclined to write 'very;' your editor will delete it and the writing will be just as it should be." (Mark Twain)
"Easy reading is damn hard writing." (Nathaniel Hawthorne)
"I was working on the proof of one of my poems all the morning, and took out a comma. In the afternoon I put it back again." (Oscar Wilde)
"Even in literature and art, no man who bothers about originality will ever be original: whereas if you simply try to tell the truth (without caring twopence how often it has been told before) you will, nine times out of ten, become original without ever having noticed it." (CS Lewis)
"When I stop working the rest of the day is posthumous. I'm only really alive when I'm writing." (Tennessee Williams)
"Any word you have to hunt for in a thesaurus is the wrong word. There are no exceptions to this rule." (Stephen King)
"Fill your paper with the breathings of your heart." (William Wordsworth)
"Do not put statements in the negative form. / And don't start sentences with a conjunction. / If you reread your work, you will find on rereading that a great deal of repetition can be avoided by rereading and editing. / Never use a long word when a diminutive one will do. / Unqualified superlatives are the worst of all. / De-accession euphemisms. / If any word is improper at the end of a sentence, a linking verb is. / Avoid trendy locutions that sound flaky. / Last, but not least, avoid cliches like the plague." (William Safire, "Great Rules of Writing")
"If I don't write to empty my mind, I go mad." (George Gordon, Lord Byron)
"It's like a novelist writing far out things. If it makes a point and makes sense, then people like to read that. But if it's off in left field and goes over the edge, you lose it. The same with musical talent, I think." (Johnny Cash)
"All my best thoughts were stolen by the ancients." (Ralph Waldo Emerson)
"That's the whole problem with science. You've got a bunch of empiricists trying to describe things of unimaginable wonder." (Bill Watterson)
"A perfectly healthy sentence, it is true, is extremely rare. For the most part we miss the hue and fragrance of the thought; as if we could be satisfied with the dews of the morning or evening without their colors, or the heavens without their azure." (Henry David Thoreau)
"As for my next book, I am going to hold myself from writing it till I have it impending in me: grown heavy in my mind like a ripe pear; pendant, gravid, asking to be cut or it will fall." (Virginia Woolf)
"I consider criticism merely a preliminary excitement, a statement of things a writer has to clear up in his own head sometime or other, probably antecedent to writing; of no value unless it comes to fruit in the created work later." (Ezra Pound)
"Writing is utter solitude, the descent into the cold abyss of oneself." (Franz Kafka)
"I have never started a poem yet whose end I knew. Writing a poem is discovering." (Robert Frost)
"I like myself better when I'm writing regularly." (Willie Nelson)
-----Sources-----
http://www.quotegarden.com/
http://www.brainyquote.com/
http://www.quotationspage.com/