Elissa

“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?”
― J.R.R. Tolkien, The Return of the King

“No more debates disturbed his mind. He knew all the arguments of despair and would not listen to them. His will was set, and only death would break it.”
― J.R.R. Tolkien, The Return of the King

“No, I am afraid not, Sam," said Frodo. "At least, I know that such things happened, but I cannot see them. No taste of food, no feel of water, no sound of wind, no memory of tree or grass or flower, no image of moon or star are left to me. I am naked in the dark, Sam, and there is no veil between me and the wheel of fire. I begin to see it even with my waking eyes, and all else fades.”
― J.R.R. Tolkien, The Return of the King

“Then Eomer was silent, and looked on his sister, as if pondering anew all the days of their past life together. But Aragorn said: "I saw also what you saw, Eomer. Few other griefs amid the ill chances of this world have more bitterness and shame for a man's heart than to behold the love of a lady so fair and brave that cannot be returned. Sorrow and pity have followed me ever since I left her desperate in Dunharrow and rode to the Paths of the Dead; and no fear upon that way was so present as the fear for what might befall her. And yet, Eomer, I say to you that she loves you more truly than me; for you she loves and knows; but in me she loves only a shadow and a thought: a hope of glory and great deeds, and lands far from the fields of Rohan.”
― J.R.R. Tolkien, The Return of the King