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心理學概念必須在行動中證明其價值。

I'm starting with the man in the mirror. I'm asking him to change his ways.

經濟史告訴我們，改變是可能的，但很少是容易的。

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.

預測未來的最好方法就是創造未來。