Alan Turing — "If you cannot explain it simply, you do not understand it well enough."
If you cannot explain it simply, you do not understand it well enough.
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More from Alan Turing
"I am a homosexual. I have been convicted of gross indecency. I have been subjected to chemical castration."
"The human mind is a very powerful computer."
"The question is not whether machines can think, but whether they can do something that we would call thinking."
"The computer is a tool for understanding the universe."
"The original question, 'Can machines think?' I believe to be too meaningless to deserve discussion."
Details
Attributed to various people, including Albert Einstein, not definitively Turing.
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Understanding this quote
What it means
True understanding reveals itself through the ability to strip complexity down to its essentials without losing accuracy. Anyone can recite technical jargon, but only someone who genuinely grasps a concept can reduce it to plain language. Clarity is not a dumbed-down substitute for knowledge—it is the test of mastery, exposing hidden gaps in thinking that layers of complexity tend to obscure.
Relevance to Alan Turing
Turing spent his career translating abstract mathematical logic—computability, decidability, formal systems—into working machines and practical codebreaking. At Bletchley Park he had to justify the Bombe device to military commanders with no mathematical background. His 1950 Turing Test paper reframed machine intelligence in plain behavioral terms anyone could evaluate. Bridging theoretical abstraction and operational clarity was not incidental to his work; it was the method.
The era
Turing worked through the 1930s–1950s, when mathematics and nascent computing were inaccessible to nearly everyone outside academia. Wartime codebreaking demanded urgent communication with military decision-makers lacking technical training. Post-war, early computers required justification to skeptical government funders. Computer science had no shared vocabulary or textbooks yet. Making complex ideas plainly understandable was not merely intellectual virtue—it was operationally necessary for survival, funding, and the field's legitimacy.
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