A thousand times rather would I have confessed myself guilty of the crime ascribed to Justine ; but I was absent when it was committed, and such a declaration would have been considered as the ravings of a madman, and would not have exculpated her who suffered through me.

In Chapter 8, Victor explains why he didn't intervene on Justine's behalf when she was accused and convicted of murdering William, despite knowing that his monster was guilty of the crime. His weak justification for allowing an innocent girl to die reveals his own cowardice and is yet another instance when he claims that a terrible occurrence (i.e. the creation of the monster, Justine's conviction) was unavoidable, and therefore not his fault.

Thus spoke my prophetic soul, as torn by remorse, horror, and despair, I beheld those I loved spend vain sorrow upon the graves of William and Justine, the first hapless victims to my unhallowed arts.

In Chapter 8, Victor reflects on the devastating consequences of his ambition and acknowledges that his actions have destroyed the people he loves most. By calling Justine and William "the first hapless victims to my unhallowed arts,” Victor recognizes that his own reckless, foolish attempts to play God have led to their deaths. His remorse and despair here underscore two of the novel’s key themes: Dangerous Knowledge and the Consequences of Ambition.