“Before one is successful that is before any one is ready to pay money for anything you do then you are certain that every word you have written is an important word to have written and that any word you have written is as important as any other word and you keep everything you have written with great care.”

Vol. I, ch. 11 http://books.google.com/books?id=R18JAAAAQAAJ&q=%22In+composing+as+a+general+rule+run+your+pen+through+every+other+word+you+have+written+you+have+no+idea+what+vigour+it+will+give+your+style%22&pg=PA382#v=onepage
Lady Holland's Memoir (1855)

Source: A Moveable Feast

Variant: My task is to make you hear, to make you feel, and, above all, to make you see. That is all, and it is everything.
Source: Lord Jim

Source: Lover Unbound

Answer to a survey written by the French mathematician Jaques Hadamard, from Hadamard's An Essay on the Psychology of Invention in the Mathematical Field (1945). Reprinted in Ideas and Opinions (1954). His full set of answers to the questions can be read on p. 3 here http://www.pitt.edu/~jdnorton/Goodies/Einstein_think/index.html.
1940s
Context: The words or the language, as they are written or spoken, do not seem to play any role in my mechanism of thought. The psychical entities which seem to serve as elements in thoughts are certain signs and more or less clear images which can be "voluntarily" reproduced and combined. There is, of course, a certain connection between those elements and relevant logical concepts. It is also clear that the desire to arrive finally at logically connected concepts is the emotional basis of this rather vague play with the above-mentioned elements.... The above-mentioned elements are, in my case, of visual and some muscular type. Conventional words or other signs have to be sought for laboriously only in a secondary stage, when the mentioned associative play is sufficiently established and can be reproduced at will.

Sakharov Prize for Freedom of Thought Acceptance Speech (2013)
Context: Why is one of the most important words in any language. You have to know why the world is the way it is or you have to want to know. If you do not have this curiosity and if you do not have the intelligence in order to be able to express this curiosity in terms that others can understand than we will not be able to contribute to progress in our world. How many of our people over these past few decades ever ask themselves why that had to submit to the authority of people who did not have the mandate of the general public. I do not think very many did. It was taken for granted that those who had power and authority could do exactly as they please. This was something that we could not accept.

Song lyrics, Blood on the Tracks (1975), Tangled Up In Blue