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There are unknown forces in nature; when we give ourselves wholly to her, without reserve, she lends them to us; she shows us these forms, which our watching eyes do not see, which our intelligence does not understand or suspect.
Mathematics is not a spectator sport.
“头脑不是要填满的容器,而是要点燃的火焰。”
Persist in doing what you love, and don't give up easily even when facing difficulties.