“It seemed proper indeed to crowd the pages with children, for in real life they run all over; the world is covered thickly with the prints of their little footsteps, though, as a rule, books written for grown-up people are kept almost clear of them.”

Puzzles of the Black Widowers (1990), pp. 74-75
General sources

The Golden Age http://www.gutenberg.org/dirs/etext95/gldna10.txt. The Finding of the Princess (1895)

Source: Inkheart

The Other World (1657)
Context: When I opened a box, I found inside something made of metal, somewhat like our clocks, full of an endless number of little springs and tiny machines. It was indeed a book, but it was a miraculous one that had no pages or printed letters. It was a book to be read not with eyes but with ears. When anyone wants to read, he winds up the machine with a large number of keys of all kinds. Then he turns the indicator to the chapter he wants to listen to. As though from the mouth of a person or a musical instrument come all the distinct and different sounds that the upper-class Moon-beings use in their language.
When I thought about this marvelous way of making books, I was no longer surprised that the young people of that country know more at the age of sixteen or eighteen than the greybeards of our world. They can read as soon as they can talk and are never at a loss for reading material. In their rooms, on walks, in town, during voyages, on foot or on horseback, they can have thirty books in their pockets or hanging on the pommels of their saddles. They need only wind a spring to hear one or more chapters or a whole book, if they wish. Thus you always have with you all the great men, both living and dead, who speak to you in their own voices.

The Paris Review interview (1994)
Context: When people ask me about LSD, I always make a point of telling them you can have the shit scared out of you with LSD because it exposes something, something hollow. Let’s say you have been getting on your knees and bowing and worshiping; suddenly, you take LSD and you look and there’s just a hole, there’s nothing there. The Catholic Church fills this hole with candles and flowers and litanies and opulence. The Protestant Church fills it with hand-wringing and pumped-up squeezing emotions because they can’t afford the flowers and the candles. The Jews fill this hole with weeping and browbeating and beseeching of the sky: How long, how long are you gonna treat us like this? The Muslims fill it with rigidity and guns and a militant ethos. But all of us know that’s not what is supposed to be in that hole. After I had been at Stanford two years, I was into LSD. I began to see that the books I thought were the true accounting books — my grades, how I’d done in other schools, how I’d performed at jobs, whether I had paid off my car or not — were not at all the true books. There were other books that were being kept, real books. In those real books is the real accounting of your life.

One Writer's Beginnings(1984)

1840s, Heroes and Hero-Worship (1840), The Hero as Prophet

It's a roll call of dead books.
Salon interview (1997)

Source: Wizard's First Rule