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The only constant in business is change.

清潔：身體、衣服及住所，力求整潔。

氣候變化的挑戰要求科學界采取緊急行動。

No arts； no letters； no society； and which is worst of all， continual fear and danger of violent death； and the life of man， solitary， poor， nasty， brutish， and short.

事情過后議論別人，身在局外議論局內人，是做學問的人最容易犯的毛病。在事后議論別人，往往將聰明人說得極其愚笨；身在局外議論局內的人，往往將困難的事情說得極其容易，這兩種毛病都是由待人不忠誠、不寬容而引起的。

Happiness in this world, when it comes, comes incidentally. Make it the objet of pursuit, and it leads us a wild-goose chase, and is never attained. Follow some other object, and very possibly we may find that we have cought happiness without dreaming of it.