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Ralph Smart 339
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"Je ne parle pas français," http://digital.library.upenn.edu/women/mansfield/bliss/bliss.html#francais from Bliss and Other Stories (1920)
Variant: I have made it a rule of my life never to regret and never to look back. Regret is an appalling waste of energy, and no one who intends to become a writer can afford to indulge in it.
Context: I have made it a rule of my life never to regret and never to look back. Regret is an appalling waste of energy, and no one who intends to become a writer can afford to indulge in it. You can't get it into shape; you can't build on it; it's only good for wallowing in.

“Never regret yesterday. Life is in you today, and you make your tomorrow.”
The Creation Of Human Ability (1954).

“There's no regret more painful than the regret of things that never were.”
Ibid., p. 111
The Book of Disquiet
Original: Ah, não há saudades mais dolorosas do que as das coisas que nunca foram!
“True remorse is never just a regret over consequence; it is a regret over motive.”
The Complete Neurotic's Notebook (1981), Unclassified