The only thing we can know is that we know nothing and that is the highest flight of human wisdom.

真理始于两人之间。

The teacher should not teach as if he were pouring knowledge into an empty vessel, but rather as if he were lighting a fire.

最好的报复就是成功和幸福。

Old soldiers never die. They just fade away.

"Wir sind nicht nur verantwortlich für das, was wir tun, sondern auch für das, was wir nicht tun."