Then he would cry, but what nobody knows nobody cares for; so he would cry till he was tired, and then fall asleep; and while we are asleep we can fe… - Hans Christian Andersen

"Then your tail will divide and shrink until it becomes what the people on earth call a pair of shapely legs. But it will hurt; it will feel as if a sharp sword slashed through you. Everyone who sees you will say that you are the most graceful human being they have ever laid eyes on, for you will keep your gliding movement and no dancer will be able to tread as lightly as you. But every step you take will feel as if you were treading upon knife blades so sharp that blood must flow. I am willing to help you, but are you willing to suffer all this?"

"Yes," the little mermaid said in a trembling voice, as she thought of the Prince and of gaining a human soul.

"Farewell, farewell," said the swallow, with a heavy heart, as he left the warm countries, to fly back into Denmark. There he had a nest over the window of a house in which dwelt the writer of fairy tales. The swallow sang "Tweet, tweet," and from his song came the whole story.

...when a storm was coming on, and they anticipated that a ship might sink, they swam before it, and sang most sweetly of the delight to be found beneath the water, begging the seafarers not to be afraid of coming down below.