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The books that we reread the most are the ones that most clearly describe the world we already know.

Reading is to the mind what exercise is to the body.

每一個科學進步都迫使我們面對新的倫理問題。

The melancholy science from which I make this offering to my friend relates to a region that from time immemorial was regarded as the true field of philosophy, but which, since the latter's conversion into method, has lapsed into intellectual neglect, sententious whimsy, and finally oblivion.

譯文：縱覽歷史，凡是賢明的國和家，成功源于勤儉，衰敗起于奢華。賞析：節儉不是吝嗇，是對錢財的合理利用。不管何時，我們都要有憂患意識，保持儉樸的作風。