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數學的本質在于它的自由。

The stranger is an element of the group itself, not unlike the poor and sundry 'inner enemies'—an element whose membership within the group involves both being outside it and confronting it.

出自漢·桓寬《鹽鐵論·刺議》。專己，指剛愎自用。拒絕忠言直諫的人就會閉塞，一意孤釋義：行的人就會孤立。治國安邦的人要認真聽取別人的意見，不能拒納諫言、一意孤行。

A good book should leave you slightly exhausted at the end. You live several lives while reading it.

你知道的越多，你看到的就越多。

以耗盡地球為代價的利潤根本不是利潤。