"La Belle Dame sans Merci" wrote by Johns Keats means "the beautiful woman without mercy". It's the title of an old French court poem by Alian Chartier. I like this poem because Keats seems to be telling us about something that may have happened, or may happen someday to us. "You discover something that you think you really like. You don't really understand it, but you"re sure it's the best thing that's ever happened to you. You are thrilled. You focus on it. You give in to the beauty and richness and pleasure, and let it overwhelm you. Then the pleasure is gone. Far more than a normal letdown, the experience has left you crippled emotionally. At least for a while, you don't talk about regretting the experience. And it remains an important part of who you feel that you are". Keats mostly writes about sensations and experiences the richness of life.
"La Belle Dame sans Merci" is a story illustrates a knight he meets a beautiful, wild-looking woman in a meadow. He visited with her, and decked her with flowers. "She did not speak, but looked and made sweet moan" (Keats, 751). He gave her his horse to ride, and she walked beside them. He saw nothing but her, because she leaned over in his face and sang a mysterious song. She spoke a language he could not understand, but he was confident she said she loved him. He kissed her to sleep, and feel asleep himself. He dreamed of a host of king, princess, and warriors, all pale as death. They shouted a terrible warning-- they were woman's slaves. And now he was her slave too.