Who said "I was benevolent and good; misery made me a fiend"?

This quote is attributed to The Creature.

I was benevolent and good; misery made me a fiend - The Creature

"I was benevolent and good; misery made me a fiend"

The Creature Change

Character in Frankenstein

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"I am malicious because I am miserable"

"Make me happy, and I shall again be virtuous"

"I am alone and miserable"

"Everywhere I see bliss, from which I alone am irrevocably excluded"

"Change brings new opportunities."

"Every day is a new opportunity."

"Healing doesn't mean forgetting."

"You either get better or you get bitter."