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>> “The name ‘Peter’ is just simply a convenient and uniquely irreproducible tag assigned by the foreknowing Master to distinguish him from all other Simon/Simeons favored with that identity. No more, no less.” <<
It also identifies one of Simon’s personality traits. He was clearly impulsive and stubborn, thus equated to a hard pebble.
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That’s just your assumption, a figurative ascription not supported by the lexicographers. You do not know the limitations of your expertise. Kepha has no figurative meaning associated with it.