„He lived alone, as Bilbo had done; but he had a good many friends, especially among the younger hobbits (mostly descendants of the Old Took), who had as children been fond of Bilbo and often in and out of Bag End[…] Frodo went tramping all over the Shire with them; but more often he wandered by himself, and to the amazement of sensible folk he was sometimes seen far from home walking in the hills and woods under the starlight[…].
Frodo himself, after the first shock, found that being his own master and the Mr. Baggins of Bag End was rather pleasant. For some years he was quite happy and did not worry much about the future. But half unknown to himself the regret that he had not gone with Bilbo was steadily growing. He found himself wondering at times, especially in the autumn, about the wild lands, and strange visions of mountains that he had never seen came into his dreams. He began to say to himself: ‘Perhaps I shall cross the River myself one day’. To which the other half of his mind replied: ‘Not yet.’
So it went on, until his forties were running out, and his fiftieth birthday was drawing near […] Frodo began to feel restless, and the old paths seemed too well-trodden. He looked at maps, and wondered what lay beyond the edges: maps made in the Shire showed mostly white spaces beyond its borders. He took to wandering further afield and more often by himself; and Merry and his other friends watched him anxiously. Often he was seen walking and talking with the strange wayfarers that began at this time to appear in the Shire.”
„When at last he had got to bed, Frodo could not sleep for some time. His legs ached. He was glad that he was riding in the morning. Eventually he fell into a vague dream, in which he seemed to be looking out of a high window over a dark sea of tangled trees. Down below among the roots there was the sound of creatures crawling and snuffling. He felt sure they would smell him sooner or later.
Then he heard a noise in the distance. At first he thought it was a great wind coming over the leaves of the forest. Then he knew that it was not leaves, but the sound of the Sea far-off; a sound he had never heard in waking life, though it had often troubled his dreams. Suddenly he found he was out in the open. There were no trees after all. He was on a dark heath, and there was a strange salt smell in the air. Looking up he saw before him a tall white tower, standing alone on a high ridge. A great desire came over him to climb the tower and see the Sea. He started to struggle up the ridge towards the tower: but suddenly a light came in the sky, and there was a noise of thunder.”
J. R. R. Tolkien, The Lord of the Rings: The Fellowship of the Ring