"Nothing in life is to be feared, it is only to be understood. Now is the time to understand more, so that we may fear less."
"Certein bodies... become luminous when heated. Their luminosity disappears after some time, but the capacity of becoming luminous afresh through heat is restored to them by the action of a spark, and also by the action of radium."
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Source: Marie Curie's letter to Eve Curie Labouisse (July 1929), as quoted in Eve Curie Labouisse Madame Curie: A Biography translated by Vincent Sheean (p. 341), 1937.
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"Life is not easy for any of us. But what of that? We must have perseverance and above all confidence in ourselves. We must believe that we are gifted for something, and that this thing, at whatever cost, must be attained."
"First principle: never to let one's self be beaten down by persons or by events."
"Be less curious about people and more curious about ideas."
"We must not forget that when radium was discovered no one knew that it would prove useful in hospitals. The work was one of pure science. And this is a proof that scientific work must not be considered from the point of view of the direct usefulness of it. It must be done for itself, for the beauty of science, and then there is always the chance that a scientific discovery may become like the radium a benefit for humanity."
"Nothing in this world is to be feared... only understood."