“Abbot Terrasson tells us that if the size of a book were measured not by the number of its pages but by the time required to understand it, then we could say about many books that they would be much shorter were they not so short.”

Address at Bennington College (30 October 1984) as published in "Reflections of a Writer: Long Work, Short Life" in The New York Times (20 March 1988)
Context: I have written almost all my life. My writing has drawn, out of a reluctant soul, a measure of astonishment at the nature of life. And the more I wrote well, the better I felt I had to write.
In writing I had to say what had happened to me, yet present it as though it had been magically revealed. I began to write seriously when I had taught myself the discipline necessary to achieve what I wanted. When I touched that time, my words announced themselves to me. I have given my life to writing without regret, except when I consider what in my work I might have done better. I wanted my writing to be as good as it must be, and on the whole I think it is. I would write a book, or a short story, at least three times — once to understand it, the second time to improve the prose, and a third to compel it to say what it still must say.
Somewhere I put it this way: first drafts are for learning what one's fiction wants him to say. Revision works with that knowledge to enlarge and enhance an idea, to re-form it. Revision is one of the exquisite pleasures of writing: The men and things of today are wont to lie fairer and truer in tomorrow's meadow, Henry Thoreau said.
I don't regret the years I put into my work. Perhaps I regret the fact that I was not two men, one who could live a full life apart from writing; and one who lived in art, exploring all he had to experience and know how to make his work right; yet not regretting that he had put his life into the art of perfecting the work.

Source: Confessions of a Young Man http://www.gutenberg.org/files/12278/12278-h/12278-h.htm (1886), Ch. 2.

Book Three, Part II “The Edge of the Sea”, Chapter 2 (p. 357)
The Birthgrave (1975)

The Trouble With Being Born (1973)

From the eighth book, "The Book of the Seducer"
The Pillow Book

Some Mistakes of Moses (1879) http://www.gutenberg.org/files/38802/38802-h/38802-h.htm Preface
Context: Too great praise challenges attention, and often brings to light a thousand faults that otherwise the general eye would never see. Were we allowed to read the Bible as we do all other books, we would admire its beauties, treasure its worthy thoughts, and account for all its absurd, grotesque and cruel things, by saying that its authors lived in rude, barbaric times. But we are told that it was written by inspired men; that it contains the will of God; that it is perfect, pure, and true in all its parts; the source and standard of all moral and religious truth; that it is the star and anchor of all human hope; the only guide for man, the only torch in Nature's night. These claims are so at variance with every known recorded fact, so palpably absurd, that every free unbiased soul is forced to raise the standard of revolt.

The Philosophy of Paine (1925)
Context: Many a person who could not comprehend Rousseau, and would be puzzled by Montesquieu, could understand Paine as an open book. He wrote with a clarity, a sharpness of outline and exactness of speech that even a schoolboy should be able to grasp. There is nothing false, little that is subtle, and an impressive lack of the negative in Paine. He literally cried to his reader for a comprehending hour, and then filled that hour with such sagacious reasoning as we find surpassed nowhere else in American letters — seldom in any school of writing.

Interview on CBS News Sunday Morning (30 November 2006)
Context: Here's a chance, I think, for us to kind of remind ourselves, of those things we all commonly enjoy and love and share, try to get back together. You know, singing out for a more peaceful world today, I think, can only do good. … I do believe that … a lot of Muslims have yet to learn, you know, the incredible great history and contribution of Islamic civilization — and its become very, if you like, in some way puritanical — that puritanical approach will become narrower and narrower and even become more fragmented. Its that vast middle ground where people actually live, you know, that we have to reclaim; and in that area, everybody should be able to live together. And I don't think that God sent us prophets and books to fight about these books and these prophets. But they were telling us, actually, how to live together. If we ignore those teachings — whichever faith you belong, you profess, then I think we'll be finding ourselves in an even deeper mess.