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歷史研究不僅關乎過去，也關乎理解現在和預見未來。

The person who tries to live alone will not succeed as a human being. His heart withers if it does not answer another heart. His mind shrinks away if he hears only the echoes of his own thoughts and finds no other inspiration.

譯文：縱欲放蕩、消極怠慢就不能勉勵心志使精神振作，冒險草率、急躁不安就不能修養性情。賞析：我們要是一直沉迷于物質享受，貪圖享樂，做任何事就會消極懈怠。做事草率魯莽，浮浮躁躁的，事情也會難以成功。