“I was benevolent and good; misery made me a fiend. Make me happy, and I shall again be virtuous.”
Source: Frankenstein
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Mary Wollstonecraft Shelley 94
English novelist, short story writer, dramatist, essayist, … 1797–1851Related quotes

"A Child's Hymn of Praise," from Hymns for Infant Minds (1810).

Jane Taylor, "A Child's Hymn of Praise," from Hymns for Infant Minds (1810)
Misattributed

“I see how happiness and misery lie inseparably in the deserts of good and bad men.”
Video, inquam, quae sit vel felicitas vel miseria in ipsis proborum atque improborum meritis constituta.
Prose V, line 1; translation by W.V. Cooper
The Consolation of Philosophy · De Consolatione Philosophiae, Book IV

Source: The Essential Groucho: Writings For By And About Groucho Marx