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The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.
"The things we do for love are often the most irrational."
"I don't think about the past. The only thing that matters is the everlasting present."
我们都是自己的幽灵,徘徊在我们曾经生活过的地方。