农业的可持续性不是一种选择，而是我们星球未来的必需品。

我们必须对外界学习保持永不满足的渴望。

Society can and does execute its own mandates， and if it issues wrong mandates instead of right， or any mandates at all in things with which it ought not to meddle， it practices a social tyranny more formidable than many kinds of political oppression， since， though not usually upheld by such extreme penalties， it leaves fewer means of escape， penetrating much more deeply into the details of life， and enslaving the soul itself.

释义：广泛地学习，恳切地提问，从而增长知识；行为高尚，言语谨慎，从而修养自身。这是对学习与修养的重视。 

文化适应不是一个被动的过程，而是一个主动的过程，涉及技术和社会的创新。