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I have learned to seek my happiness by limiting my desires, rather than in attempting to satisfy them.
心理学必须是一门观察的科学,而非推测。
I have already carried out my duty. I have proved the Poincaré conjecture and I have nothing more to do in mathematics.
We are all just passing through, ephemeral, and yet we leave behind traces of our existence.
The more you love, the more you can love—and the more intensely you love.