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Mathematics is not a spectator sport. You have to do it to understand it.
What I want to talk to you about today is the difference between gifts and choices. Cleverness is a gift, kindness is a choice. Gifts are easy -- they're given after all. Choices can be hard. You can seduce yourself with your gifts if you're not careful, and if you do, it'll probably be to the detriment of your choices.
To write is to breathe, to live, to exist beyond the confines of time.
真正的成长发生在你走出舒适区并拥抱变化的时候。
一个人真正的财富是他的记忆。除此之外,他既不富有也不贫穷。