天下的一切事物不可以没有标准，做人要有做人的标准，即原则；做事要有做事的标准，即规则；治国要有治国的标准，即法则。不遵循一定的标准而能成事者，自古以来是没有的。
The poor perpetually sell their time cheaply, yet can never buy it back.
The despotism of custom is everywhere the standing hindrance to human advancement.
The challenge is not just to collect data, but to make sense of it in ways that improve lives.