Chapter vii of Tolkien's Return of the King (Lord of the Rings)
Homeward Bound
At last the hobbits had their faces turned towards home. They were eager now to see the Shire again; but at first they rode only slowly, for Frodo had been ill at ease. When they came to the ford of Bruinen, he halted and seemed Loth to ride into the stream; and they noted that for a while his eyes appeared not to see them or things about him. All that day he was silent. It was the sixth of October.
" Are you in pain, Frodo ?" Said Gandalf, quietly, as he rode by Frodo's side.
"Well, yes I am," said Frodo. "It's my Shoulder, the wound aches and the memory of darkness is heavy on me. It was a year ago today."
"Alas, there are some wounds that cannot be wholly cured," said Gandalf.
"I fear it may be so with mine," said Frodo. "There's 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?"
Gandalf did not answer.
By the next day, the pain and unease had passed, and Frodo was merry again, as merry as if he did not remember the blackness of the day before. After that, the journey went well, ...