Mathematics is not a spectator sport; to understand it, one must engage with it actively.
数学不是一项观赏性运动;要理解它,必须积极参与其中。
你无法控制你无法衡量的东西。
【译文】国家强盛源于法治,衰弱混乱源于徇私。
The only way you can write the truth is to assume that what you set down will never be read.
Every book is a journey, and every journey is a book.
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