“Learning is the only thing the mind never exhausts, never fears, and never regrets.”
The quote "Learning is the only thing the mind never exhausts, never fears, and never regrets." is famous quote attributed to Leonardo Da Vinci (1452–1519), Italian Renaissance polymath.
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Leonardo Da Vinci 363
Italian Renaissance polymath 1452–1519Related quotes

“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!

“Whoever has three things will never regret:”
1) Refraining from haste
2) Consulting (with others)
3) And depending upon God when making decisions
Misnad al-Imām al-Jawād, p. 247
Religious Wisdom

"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.
“One of my only regrets is that I was never able to fall in love.”
Journal found in his car

“I never learn anything talking. I only learn things when I ask questions.”

“Governments never learn. Only people learn.”
Statement made in 1980, as quoted in The Cynic's Lexicon : A Dictionary Of Amoral Advice (1984), by Jonathon Green, p. 77

“You’ve just described nine-tenths of human history.”
Open and Shut (p. 265)
Short fiction, Belladonna Nights and Other Stories (2021)