Enrico Fermi — "It is not enough to know how to build a bomb. One must also know how to control …"
It is not enough to know how to build a bomb. One must also know how to control it.
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More from Enrico Fermi
"Whatever you do, don't let them make you a manager."
"I believe that science is a universal language, and that it can bring people together from all over the world."
"The greatest tragedy of science is the slaying of a beautiful hypothesis by an ugly fact."
"The mind is not a vessel to be filled, but a fire to be kindled."
"We must always strive to use our knowledge for the betterment of humanity, and not for its destruction."
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Understanding this quote
What it means
Technical mastery of a powerful force is necessary but insufficient. True responsibility demands the ability to govern what you create—through safety systems, policies, ethics, and restraint. Whether applied to nuclear weapons, artificial intelligence, or any transformative technology, the principle holds: capability without control is dangerous. The wisdom to limit, regulate, and direct power matters as much as the knowledge to generate it.
Relevance to Enrico Fermi
Fermi built Chicago Pile-1 in 1942—the world's first self-sustaining nuclear chain reaction—then worked at Los Alamos on the Manhattan Project and witnessed the Trinity test. Having personally unlocked fission's destructive potential, he understood that physics outpaced governance. He later co-authored a minority advisory report opposing the hydrogen bomb on ethical grounds, embodying this tension between scientific knowledge and responsible restraint.
The era
The atomic bombings of Hiroshima and Nagasaki in 1945 proved nuclear weapons could annihilate cities instantly. The Soviet Union detonated its first bomb in 1949, igniting a Cold War arms race with no clear endpoint. Scientists who built these weapons suddenly faced urgent questions about proliferation and existential risk. The Atomic Energy Act and early arms-control debates reflected a civilization scrambling to govern what it had unleashed.
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