“He thought for a moment, brought back from his reflections. "It was only possible for me to do it," he said, "because it was necessary. I either had to write the book or be reduced to despair; it was the only means of saving me from nothingness, chaos and suicide. The book was written under this pressure and brought me the expected cure, simply because it was written, irrespective of whether it was good or bad. That was the only thing that counted. And while writing it, there was no need for me to think at all of any other reader but myself, or at the most, here and there another close war comrade, and I certainly never thought then about the survivors, but always about those who fell in the war. While writing it, I was as if delirious or crazy, surrounded by three or four people with mutilated bodies — that is how the book was produced."”

Source: Andre Cornelis (1886), Ch. 14
Context: I had to take the necessary steps to prevent this alleged suicide from getting known, to see the commissary of police and the "doctor of the dead." I had to preside at the funeral ceremonies, to receive the guests and act as chief mourner. And always, always, he was present to me, with the dagger in his breast, writing the lines that had saved me, and looking at me, while his lips moved.
Ah, begone, begone, abhorred phantom! Yes! I have done it; yes! I have killed you; yes! it was just. You know well that it was just. Why are you still here now? Ah! I will live; I will forget. If I could only cease to think of you for one day, only one day, just to breathe, and walk, and see the sky, without your image returning to haunt my poor head which is racked by this hallucination, and troubled? My God! have pity on me. I did not ask for this dreadful fate; it is Thou that hast sent it to me. Why dost Thou punish me? Oh, my God, have pity on me!

"The Hard Kind of Courage" in Harper's (October 1958) republished as "A Fly in Buttermilk" in Nobody Knows My Name: More Notes of a Native Son (1961)

Explaining why he used many different pseudonyms.
Oxford Companion to Children's Literature: "Charles Hamilton" (pages 235-7)

The Expanding Universe (1963)
Context: I heard a famous author say once that the hardest part of writing a book was making yourself sit down at the typewriter. I know what he meant. Unless a writer works constantly to improve and refine the tools of his trade they will be useless instruments if and when the moment of inspiration, of revelation, does come. This is the moment when a writer is spoken through, the moment that a writer must accept with gratitude and humility, and then attempt, as best he can, to communicate to others.
A writer of fantasy, fairly tale, or myth must inevitably discover that he is not writing out of his own knowledge or experience, but out of something both deeper and wider. I think that fantasy must possess the author and simply use him. I know that this is true of A Wrinkle in Time. I can’t possibly tell you how I came to write it. It was simply a book I had to write. I had no choice. And it was only after it was written that I realized what some of it meant.
Very few children have any problem with the world of the imagination; it’s their own world, the world of their daily life, and it’s our loss that so many of us grow out of it.

As quoted in Literature for Today's Young Adults (1997) by Kenneth L. Donelson and Alleen Pace Nilsen, p. 392
Context: It's not just the books under fire now that worry me. It is the books that will never be written. The books that will never be read. And all due to the fear of censorship. As always, young readers will be the real losers.

Source: Perfect Match