Alan Turing — "The important thing is not to stop questioning."
The important thing is not to stop questioning.
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More from Alan Turing
"The question is not 'Can machines think?' but 'Can machines do what we (as thinking entities) can do?'"
"The idea behind digital computers may be explained by saying that these machines are intended to carry out any operations which could be done by a human computer."
"The human mind is a complex adaptive system."
"It seems probable that once the machine thinking method had started, it would not take long to outstrip our feeble powers and would take control."
"The popular view that scientists proceed inexorably from well-established fact to well-established fact, never being influenced by any unproved conjecture, is quite mistaken. Provided it is made clear…"
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Understanding this quote
What it means
Curiosity is essential — never accept what you've been told as the final word. Keep asking why, how, and what if, even when answers seem settled. This is how progress happens: by refusing to treat current understanding as complete. Intellectual restlessness isn't a flaw; it's the engine of discovery. The moment you stop questioning, you stop growing and risk mistaking convention for truth.
Relevance to Alan Turing
Turing built his career on relentless questioning. He asked whether machines could think, producing the Turing Test — computing's foundational thought experiment. At Bletchley Park he questioned every assumption about the Enigma cipher until his Bombe machine cracked it, shortening WWII by years. He also lived openly as a gay man in a country that criminalized it, refusing to accept that curiosity about identity should be suppressed by law.
The era
Turing worked during the 1940s–1950s, a period of rigid social conformity alongside explosive scientific change. WWII demanded unconventional thinkers at Bletchley Park to crack what seemed uncrackable. Post-war, the Cold War race to build thinking machines intensified. Yet British society punished nonconformity severely — Turing was chemically castrated by court order in 1952. In this era, questioning authority carried genuine, devastating personal consequence.
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