THE WATER BABIES
will not let you pass without this passport of mine, which you must hang round your neck and take care of; and, of course, as the dog will always go behind you, you must go the whole way backward."
"Backward!" cried Tom. "Then I shall not be able to see my way."
"On the contrary, if you look forward, you will not see a step before you, and be certain to go wrong; but if you look behind you and watch carefully whatever you have passed, and especially keep your eye on the dog, who goes by instinct, and therefore can't go wrong, then you will know what is coming next, as plainly as if you saw it in a looking-glass."
Tom was very much astonished, but he obeyed her, for he had learnt always to believe what the fairies told him.
"So it is, my dear child," said Mother Carey; "and I will tell you a story, which will show you that I am perfectly right, as it is my custom to be.
"Once on a time, there were two brothers. One was called Prometheus, because he always looked before him and boasted that he was wise beforehand. The other was called Epimetheus, because he always looked behind him, and did not boast at all; but said humbly, like the Irishman, that he had sooner prophesy after the event.
"Well, Prometheus was a very clever fellow, of course, and invented all sorts of wonderful things. But, unfortunately, when they were set to work, to
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