As soon as I saw this thread, I immediately thought of Kurt Vonnegut. You already posted one of his, but oh well. He has too many great quotes.
"People aren't supposed to look back. I'm certainly not going to do it anymore.
I've finished my war book now. The next one I write is going to be fun.
This one is a failure, and had to be, since it was written by a pillar of salt."
- Kurt Vonnegut. Slaughterhouse-five
Not too sure why. But that always gives me the chills (as did most of the book), whenever I read it.
Also this, from the same book.
"It is so short and jumbled and jangled, Sam, because there is nothing intelligent to say about a massacre. Everybody is supposed to be dead, to never say anything or want anything ever again. Everything is supposed to be very quiet after a massacre, and it always is, except for the birds."
-Kurt Vonnegut