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The only way to learn mathematics is to do mathematics.
Every mathematical problem has a solution; the challenge is finding it.
成功的关键是在生活的各个方面不断成长——精神上、情感上、灵性上,还有身体上。
记忆是我们以为已经忘记的东西;它是我们已经忘记自己忘记了的东西。
Every challenge is an opportunity in disguise.