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数学是人类精神最美丽和最强大的创造。
Mathematics is the most beautiful and most powerful creation of the human spirit.
Knowledge is a consequence of experience.
The only thing that can bring you happiness is yourself.
The most resilient economies are those that invest in all their people.
The primary rules of obligation are those that require or forbid certain actions.
The best books are the ones that challenge you.
Sir, where are you running? Are you doing this for world peace? Are you doing this for the homeless? Are you running for women's rights? The environment? They just couldn't believe that somebody would do all that running for no particular reason. Why are you doing this? I just felt like running. I just felt like running.