“The measure of an author's power would be best found in the book which he should sit down to write the day after his library was burnt to the ground.”

Source: Flaubert's Parrot

Zen and the Art of Motorcycle Maintenance (1974), Afterword (1984)
Context: A culture-bearing book, like a mule, bears the culture on its back. No one should sit down to write one deliberately. Culture-bearing books occur almost accidentally, like a sudden change in the stock market. There are books of high quality that are an part of the culture, but that is not the same. They are a part of it. They aren't carrying it anywhere. They may talk about insanity sympathetically, for example, because that's the standard cultural attitude. But they don't carry any suggestion that insanity might be something other than sickness or degeneracy.

The History of Joseph Smith by His Mother (1853), "Rigdon's Depression"

And all of the noise and the clamor in the library ceased, and there was a hush in the library, for all of the books knew who the real master of the library was.
"Ministers of Justice", Address delivered at the Eighty-Second Annual Convention of the Tennessee Bar Association at Gatlinburg, June 5, 1963; published in 31 Tennessee Law Review 1 (Fall 1963), p. 19.

Source: Titus Groan (1946), Chapter 29 “The Library” (p. 158)

[Morgan, Forrest, Shakespeare—the Man, published in the Prospective Review, July 1853, The works of Walter Bagehot, vol. 1, 1891, Hartford, Connecticut, Travelers Insurance Company, https://babel.hathitrust.org/cgi/pt?id=njp.32101064786716;view=1up;seq=373, 265–266 of 255–302]
Shakespeare—the Man (1853)

223
Fruits of Solitude (1682), Part I

Source: The Beekeeper's Apprentice

The Author As Reader, p. 259.
A History of Reading (1996)