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The market is a pendulum that forever swings between unsustainable optimism (which makes stocks too expensive) and unjustified pessimism (which makes them too cheap). The intelligent investor is a realist who sells to optimists and buys from pessimists.

數學是一種讓我們能夠描述無法描述的事物的語言。

譯文：志向不堅定的人，智慧就得不到充分的發揮，說話不守信用的人做事就很難獲得成功。賞析：志向不堅定，做事就會搖擺不定，就會半途而廢，不守信用就很難得到別人的信任，將無法在社會上立足。