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 again became a mouse.
Young Commodore Oliver H.Perry, not twenty-eight years old, was intrusted with the plan to gain control of Lake Erie.

With great energy Perry directed the construction of nine ships, carrying fifty-four guns, and conquered Commodore Barclay, a veteran of European navies, with six vessels, carrying sixty-three guns.

Perry had no experience in naval battles before this.
To believe a business impossible is the way to make it so.