“There is an art in taking the whiplash of suffering full in the face, an art you must learn. Let each single attack exhaust itself; pain always makes single attacks, so that its bite may be more intense, more concentrated. And you, while its fangs are implanted and injecting their venom at one spot, do not forget to offer it another place where it can bite you, and so relieve the pain of the first.”
This Business of Living (1935-1950)
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Cesare Pavese 137
Italian poet, novelist, literary critic, and translator 1908–1950Related quotes

Source: The Limits of Evolution, and Other Essays, Illustrating the Metaphysical Theory of Personal Ideaalism (1905), The Art-Principle as Represented in Poetry, p.210

Originates in a 2007 blog post by Iain S. Thomas entitled The Fur http://www.iwrotethisforyou.me/2007/08/fur.html
Misattributed

Já me desenganei que de queixar-me
não se alcança remédio; mas, quem pena,
forçado lhe é gritar, se a dor é grande.
Gritarei; mas é débil e pequena
a voz para poder desabafar-me,
porque nem com gritar a dor se abrande.
"Vinde cá, meu tão certo secretário", trans. by Landeg White in The Collected Lyric Poems of Luis de Camoes (2016), p. 297
Lyric poetry, Hymns (canções)