Where in A Separate Peace is the quote, “I began to know that each morning reasserted the problems of night before, that sleep suspended all but changed nothing, that you couldn’t make yourself over between dawn and dusk"?
The quote, "I began to know that each morning reasserted the problems of night before, that sleep suspended all but changed nothing, that you couldn't make yourself over between dawn and dusk," is located in chapter 8. In my copy of the book, it starts at the bottom of page 105 and continues to page 106.
It's a quote that shows how much the main character is growing up and recognizing realities of the world. Before he thought that each day was new, a clean slate. But now he finally seems to come to terms with the fact that the problems of the previous day actually carry forward. In this quote we find the main character comparing himself to Phineas. Phineas still thinks each day holds promise, that somehow when he awakens his injuries will be gone. However, each morning he realizes anew that he is still "crippled and in a cast."