以物易物、互通有无的倾向是人类共有的，也是其他动物所没有的。
Every scientific discovery should be measured by its contribution to human welfare.
平静：不要被琐事、普通或者不可避免的事所扰。
Courage is the most important of all the virtues because without courage, you can't practice any other virtue consistently.
Your struggles don't define you; how you overcome them does.
"Sometimes the greatest act of rebellion is simply to remember."
