they will prove the truth of my tale
Again, the creature seems to echo Victor Frankenstein (though, since
Victor's narrative to Walton postdates the Creature's by several years it
is actually he who is engaged in echoing). Wherever in the narrative
nesting we look to find a foundation for its truth, we discover both
Victor and the Creature seeking to establish the evidence that will verify
their accounts and using almost identical language to do so. One may thus
compare this utterance with those of Victor to Walton at the beginning (Letter 4.8 and note) and end (Walton 1) of his narrative. That the
"evidence" comes from the centrally embedded narrative, the story of
Safie, is thus taken to lend credibility to all narrative strands that
subsume it. But, of course, these putative copies of letters depend
entirely on the Creature's word for their authenticity: so there is
actually no documentary foundation whatsoever for the "truth" of any of
these fictions. Still, it is indicative that Victor Frankenstein produces
the letters to convince Walton of his veracity (Walton 1).