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The worth of a psychological theory is measured by its usefulness.

第一次與巴爾蒂人喝茶，你是陌生人；第二次，你是尊貴的客人；第三次，你成為家人。

I want to create a world where everything is connected.

What can be said at all can be said clearly, and what we cannot talk about we must pass over in silence.

解釋：節儉就會產生對生產不利的因素，侈靡則造成對財富的耗費。

最偉大的禮物是對閱讀的熱情。