“In the deepest sense, the being in a state of sin is the sin, the particular sins are not the continuation of sin, they are expressions of its continuation.”

As quoted in "Samuel Beckett Talks About Beckett" by John Gruen, in Vogue, (December 1969), p. 210
Comparable to "The tragic figure represents the expiation of original sin, of the original and eternal sin of him and all his 'soci malorum,' the sin of having been born. 'Pues el delito mayor / Del hombre es haber nacido.'" from his essay Proust, quoting Pedro Calderón de la Barca's La vida es sueño (Life is a Dream).

Source: Living Beyond Your Feelings: Controlling Emotions So They Don't Control You

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.

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

The Tragic Sense of Life (1913), IV : The Essence of Catholicism
Context: The real sin — perhaps it is a sin against the Holy Ghost for which there is no remission — is the sin of heresy, the sin of thinking for oneself. The saying has been heard before now, here in Spain, that to be a liberal — that is, a heretic — is worse than being an assassin, a thief, or an adulterer. The gravest sin is not to obey the Church, whose infallibility protects us from reason.

From ‘’Justice’’ in Unspoken Sermons Series III (1889)
Context: If sin must be kept alive, then hell must be kept alive; but while I regard the smallest sin as infinitely loathsome, I do not believe that any being, never good enough to see the essential ugliness of sin, could sin so as to deserve such punishment. I am not now, however, dealing with the question of the duration of punishment, but with the idea of punishment itself; and would only say in passing, that the notion that a creature born imperfect, nay, born with impulses to evil not of his own generating, and which he could not help having, a creature to whom the true face of God was never presented, and by whom it never could have been seen, should be thus condemned, is as loathsome a lie against God as could find place in heart too undeveloped to understand what justice is, and too low to look up into the face of Jesus.

Book III, iv, 9
Amores (Love Affairs)

Source: Saint Silouan the Athonite (1991), p. 83