如果你借了什么东西，试着在归还的时候把它变得比你借到时的状态更好。清洁它、打磨它、填充它。

领导力在于因为你的存在而使他人变得更好，并确保这种影响在你离开后依然持续。

Liberty means responsibility. That is why most men dread it.

The value or worth of a man is, as of all other things, his price; that is to say, so much as would be given for the use of his power.

Sustainability is not an option; it's a responsibility we owe to future generations.

反馈的研究就是自我调节系统的研究。