The detail that is suggestive of the fact that the lifting of the stone is central to the development of the theme "How Theseus Lifted the Stone" is that The stone was impelled with a sword, and anyone who successful lifts the sword was worthy and became the next king.
Theme development refers to the acts within the story that contribute to strengthening the theme.
The theme in this case is that no matter how low life has brought a person, their destiny for greatness cannot be changed.
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