成功不是幸福的关键。幸福是成功的关键。如果你热爱你所做的事情，你就会成功。
Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.
不成熟状态就是不经别人的引导就无力运用自己的理智。
经济学的研究最终是对人类行为及其后果的研究。
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.