The most sustainable product is one that lasts.

The smart way to keep people passive and obedient is to strictly limit the spectrum of acceptable opinion, but allow very lively debate within that spectrum.

我饭吃但是如果不吃，对于饥饿是没有益处的。见到了贤能的人们而不去任用，这样对于衰弱的国家，也是没有益处的。