Answer:
The stones symbolize the boy's journey to his true self, giving him the strength to continue working toward his goal.
Explanation:
The stones are the way that he is reminded to continue on his journey to find himself. They answer 'Yes' and 'No' and are particular sign to the character to follow the signs and/or omens that are presented to him.
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There like God eyes watching over everything you do.
Whenever repetition is used, it is used to bring attention to the main point, and to make it more memorable in the listener's minds. This makes you remember this phrase more, and makes you more likely to agree with it.