The hopelessness of any one's accomplishing any thing without pluck is illustrated by an old East Indian fable. A mouse that dwelt near the abode of a great magician was kept in such constant distress by its fear of a cat, that the magician, taking pity on it, turned it into a cat itself.
Immediately it began to suffer from its fear of a dog, so the magician turned it into a dog. Then it began to suffer from fear of a tiger, and the magician turned it into a tiger. Then it began to suffer from its fear of huntsmen, and the magician in disgust said, " Be a mouse again. As you have only the heart of a mouse, it is impossible to help you by giving you the body of a nobler animal."
And the poor creature became a mouse.