“The mildness of my nature had fled, and all within me was turned to gall and bitterness. The nearer I approached to your habitation, the more deeply did I feel the spirit of revenge enkindled in my heart. Snow fell, and the waters were hardened; but I rested not.”

– Mary Shelley

Frankenstein, Chapter 16. The monster’s mild nature has turned to bitterness and thoughts of revenge.