“The greatest sin, after the initial sin, is its publication.”
O maior pecado, depois do pecado, é a publicação do pecado.
Quincas Borba (1891) ch. 32; Clotilde Wilson (trans.) Philosopher or Dog? (New York: Noonday Press, 1954) p. 41.
Original
O maior pecado, depois do pecado, é a publicação do pecado.
"Quincas Borba" (1891), capítulo XXXII; veja (wikisource)
Romances, Quincas Borba
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Machado de Assis 16
Brazilian writer 1839–1908Related quotes

“To create a public scandal is what's wicked;
To sin in private is not a sin.”
Le scandale du monde est ce qui fait l'offense,
Et ce n'est pas pécher que pécher en silence.
Act IV, sc. v
Tartuffe (1664)

“Perhaps the greatest sin in the world today is that men have begun to lose the sense of sin.”
Radio Message of His Holiness Pius XII to Participants in the National Catechetical Congress of the United States in Boston https://w2.vatican.va/content/pius-xii/en/speeches/1946/documents/hf_p-xii_spe_19461026_congresso-catechistico-naz.html, from Castel Gandolfo on Saturday, 26 October 1946

“Ugliness is the greatest of all sins.”
Quoted by M. Samuel, Prince of the Ghetto, 146.

“Lying is the greatest of all sins.”

Source: The Sickness Unto Death: A Christian Psychological Exposition for Upbuilding and Awakening

“The greatest sin is to think yourself weak”
Source: Pearls of Wisdom

Biharul Anwar, Volume 96, Page 248
Shi'ite Hadith