From The Hobbit by JRR Tolkien:

As they sang the hobbit felt the love of beautiful things  made by hands and by cunning and by magic moving through him, a fierce and a jealous love, the desire of the hearts of dwarves.  Then something Tookish woke up inside him, and he wished to go and see the great mountains, and hear the pine-trees and the waterfalls, and explore the caves, and wear a sword instead of a walking-stick.  He looked out of the window.  The stars were out in a dark sky above the trees.  He thought of the jewels of the dwarves shining in dark caverns.  Suddenly in the wood beyond The Water a flame leapt up– probably somebody lighting a wood-fire– and he thought of plundering dragons settling on his quiet Hill and kindling it all to flames.  He shuddered; and very quickly he was plain Mr. Baggins of Bag-End, Under-Hill, again.

But then later:

“Go back?” he thought.  “No good at all!  Go sideways? Impossible! Go forward?  Only thing to do!  On we go!”  So up he got, trotted along with his little sword held in front of him and one hand feeling the wall, and his heart all of a patter and a pitter.

Happy birthday, Mr. Tolkien.  Much obliged to you.