"Everything you need is inside" means
What Clara needs is not her mother's relics (such as the dress her sister received), nor her constant companionship (Clara recalled that she wanted her mother to take her to that beautiful place, but her mother had passed away, and this wish could not be fulfilled) It comes from the firmness of Clara's heart, so this inside is a pun. On the surface, it is inside this exquisite egg, but it is actually inside of herself, a strong mind that is no longer confused. The message left by her mother made Clara embark on a journey to find the key. This key is also a pun. It is not only the key to open the egg, but also the key to open her own soul.
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