The Return of the King
"Alas! there are some wounds that cannot be wholly cured," said Gandalf.
"I fear it may be so with mine," said Frodo. "There is no real going back. Though I may come to the Shire, it will not seem the same; for I shall not be the same. I am wounded with knife, sting, and tooth, and a long burden. Where shall I find rest?" (6.7.4-5)