To be free is to accept responsibility for one's own life.
以这样奢侈的国君,去统治那些爱好奢侈的臣民,想要国家不动乱,是不可能的。
The world is a great river, and we are the fish.
The Internet is not just a technology, it's a social phenomenon.
当且仅当所有投资者都持有均值-方差有效的投资组合时，市场组合才是有效的。