“I know, I'm an idiot!" Leo moaned. "A brilliant idiot, but still an idiot.”
Source: The Demigod Diaries
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Rick Riordan 1402
American writer 1964Related quotes

“One idiot is one idiot. Two idiots are two idiots. Ten thousand idiots are a political party.”
Was written in a slightly different way by Leo Longanesi in Italian, above form has been attributed to Kafka without evidence.
Misattributed
Source: One Idiot Is One Idiot. Two Idiots Are Two Idiots. Ten Thousand Idiots Are a Political Party, Quote Investigator, 2021-10-08 https://quoteinvestigator.com/2021/10/08/idiots/,

La fama no cambia a nadie, lo único que hace es descubrir a los idiotas; si eres un idiota anónimo, sólo lo saben en tu casa y poco más, pero cuando eres famoso, lo sabrán en todo el mundo que lo eres.
blog oficial Patricia Conde

“You're an idiot, babe. It's a wonder that you still know how to breathe.”
Song lyrics, Blood on the Tracks (1975), Idiot Wind

“If I decide to be an idiot, then I’ll be an idiot on my own accord.”

"Structure of Power in America", The British Journal of Sociology, Vol. 9 (March 1958).
1950s
“You're thinking I'm a hopelessly romantic idiot.
And you know what?
You're right.”
Source: What My Girlfriend Doesn't Know

“Vermouth always makes me brilliant unless it makes me idiotic, but we'll hope for the best.”
Source: Queen Lucia (1920), p. 222.