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The best designs come from understanding the needs of the people who will use them.

能量守恒定律是經驗結果的概括。

活著是世界上最罕見的事，大多數人只是存在，僅此而已。

Every mental state exists for a purpose; to understand it, we must ask what function it serves in the broader system of behavior.

解釋：只要心胸坦蕩，不必顧慮沒有施展抱負的地方。

翻譯：國君有的命令可以不接受。

Leadership means making tough decisions today that will shape a better tomorrow.