The concept of loss aversion explains why we often prefer avoiding losses over acquiring gains.

Happiness is not the absence of problems, but the ability to deal with them.

忠于自己，但永远保持学习的心态。

Everyone is in favor of free speech. Hardly a day passes without its being extolled， but some people's idea of it is that they are free to say what they like， but if anyone else says anything back， that is an outrage.

真相很少是纯粹的，也从不简单。