“This person has done at least two (2) things that would be classified as "unforgivable."”
Chuck Klosterman IV: A Decade of Curious People and Dangerous Ideas (2006), Recognizing Your Archenemy
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1950s, The Impact of Science on Society (1952)

“There are some things that are so unforgivable that they make other things easily forgivable.”
Source: Half of a Yellow Sun

“There's not the least thing can be said or done, but people will talk and find fault.”
Source: Don Quixote de la Mancha (1605–1615), Part I, Book II, Ch. 4.
Gordon Hendricks: "The Life And Work Of Thomas Eakins", Grossman Publishers : New York 1974, ISBN 0-670-42795-0, p. 160
The photographs were studies for Eakins' painting Swimming, Hendricks was the first to connect Eakins with homosexuality.

“Does being a man make all things forgivable and being a woman all things unforgivable?”
Portrayal of Women in Premchands Stories A Critique
The Proletariat and Education: The Necessity for Labor Colleges

“As to diseases, make a habit of two things — to help, or at least, to do no harm.”
Epidemics, Book I, Ch. 2, Full text online at Wikisource
Variant translation: The physician must be able to tell the antecedents, know the present, and foretell the future — must mediate these things, and have two special objects in view with regard to disease, namely, to do good or to do no harm.
Paraphrased variants:
Wherever a doctor cannot do good, he must be kept from doing harm.
Viking Book of Aphorisms : A Personal Selection (1988) by W. H. Auden and Louis Kronenberger, p. 213.