The fury of a demon instantly possessed me. I knew myself no longer. My original soul seemed, at once, to take its flight from my body; and a more than fiendish malevolence, gin-nurtured, thrilled every fibre of my frame.
The speaker experiences an overwhelming rage, described as the fury of a demon, which consumes their entire being. This intense emotion leads to a disconnection from their true self, as if their original soul has abandoned them. They become overtaken by a sinister and malevolent force, intensified by their indulgence in alcohol.
This transformation highlights the struggle between the individual's inherent nature and the dark impulses that can arise from external influences like substance abuse. The quote encapsulates the descent into madness, portraying how the combination of inner turmoil and addiction can completely alter one’s identity and morals.