“No one can truthfully boast or say in anger: I cannot be unhappier than I am.”

— Giacomo Leopardi , book Zibaldone

13-14th August 1821.
Zibaldone (1898)

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Do you have more details about the quote "No one can truthfully boast or say in anger: I cannot be unhappier than I am." by Giacomo Leopardi?

Giacomo Leopardi 18

Italian poet, philosopher and writer 1798–1837

Protima Bedi (1948–1998) Indian model and dancer

Quoted in "I have been a hippie all my life".

“I live lies because I cannot endure the weakness of anger, and I cannot admit the irrationality of love.”

Anne Rice (1941) American writer

Source: Blood And Gold

“The US did think of replacing Saddam with some army officers. At the time (2002-03) I bristled with anger at the idea. I still would not accept it. And yet I cannot deny that it just might have led to a situation that was better than the one we face at the present.”

Kanan Makiya (1949) American orientalist

"Kanan Makiya speaks about Iraq 5 years later...", Washington Post (March 20, 2008)

“When you are angry, it means you, yourself are unhappy. Even if you are wronged, you are still making yourself unhappy if you feel anger.”

Michio Kushi (1926–2014) Japanese educator

Source: Spiritual Journey: Michio Kushi's Guide to Endless Self-Realization and Freedom (1994, with Edward Esko), p. 41

“I have learned, I am not a child and I have learned that… when I’ve spoken in anger, I usually regret the way I express myself. So I’ve been waiting to feel less angry. And when I’m ready, I’ll say what I have to say.”

Uma Thurman (1970) American actress and model

"Uma Thurman on Harvey Weinstein and sexual misconduct in Hollywood: 'When I’m ready, I’ll say what I have to say" http://www.telegraph.co.uk/films/2017/11/05/uma-thurman-harvey-weinstein-sexual-misconduct-hollywoodwhen/, Telegraph Reporters, Telegraph, 5 November 2017.