When you change the way you look at things, the things you look at change.

译文：即使处在平安的环境，也要时刻想到可能会有突如其来的危险。

A miner’s helmet doesn’t just protect the head—it symbolizes the dignity of hard work.

The tyranny of a prince in an oligarchy is not so dangerous to the public welfare as the apathy of a citizen in a democracy.

网络的价值与系统连接用户数量的平方成正比。