主要的义务规则是那些要求或禁止某些行为的规则。
The best way to predict the future is to create it.
The most damaging phrase in the language is: 'It's always been done this way.'
A good abstraction is one that emphasizes the essential and suppresses the irrelevant.
"The only thing necessary for the triumph of evil is for good men to do nothing."
The bond market is the most important market in the world.