关于幸福，你只有在失去它的时候才知道你曾经拥有过。
The thing about happiness is that you only know you had it when it's gone.
The whole is other than the sum of the parts.
我的一生都在与恐惧和焦虑作斗争。
历史不会重演，但总会惊人地相似。”
Economics is the study of how societies use scarce resources to produce valuable goods and services and distribute them among different individuals. If we think about the definitions, we find two key ideas that run through all of economics:
Liberal democracy may constitute the "end point of mankind's ideological evolution" and the "final form of human government."
We change our behavior when the pain of staying the same becomes greater than the pain of changing. Consequences give us the pain that motivates us to change.
嫉妒不是爱的标志，而是对失去有价值关系的威胁的防御。
"The serve is the most important shot in tennis."
实现梦想的唯一方法是每天努力工作。