“The first principle of cosmology must be 'There is nothing outside the universe'. This is not to exclude religion or mysticism… But if it is knowledge that we desire… we need to seek answers to questions about the things we can see… only things that exist in the universe.”

—  Lee Smolin , book Three Roads to Quantum Gravity

Three Roads to Quantum Gravity (2000)

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Lee Smolin 52
American cosmologist 1955

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