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Supermundane - The Inner Life - Book 2 (1938) - 399:
I speak about these ancient achievements in order to put to shame many of our contemporaries, who are proud of their numerous discoveries but often cannot maintain the simplest conditions necessary for their experiments. Furthermore, people do not wish to learn patience. They should think about what great patience was needed by the ancients for the investigation of alloys. As the centuries passed some metals were forgotten and later rediscovered. It is instructive to note how many things were forgotten by humanity! Among these was radium, which in ancient times had another name; it was called "heart of the firmament."
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