我不是说唱歌手，我是一个地理的传奇。

如果你认为一个理论是唯一可能的理论，这表明你既不理解这个理论，也不理解这个理论要解决的问题。

增长来自于冒险，但必须是经过计算的冒险。

你无法改变你拒绝面对的事情。

世路风霜艰险，是我们锤炼思想的环境；世情冷暖，是我们克制性情的时机；世事是非颠倒，是我们修身实践的凭借。

The golden rule is that there are no golden rules.

I think it's very important to have a feedback loop, where you're constantly thinking about what you've done and how you could be doing it better.

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.