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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.

世界所有前進的動力都歸功于不安分的人。快樂的人不可避免地把自己限制在古老的界限內。

增長的關鍵不僅在于擴大市場，還在于深化關系。