夜晚是一本伟大的书，但星星是它的字母。
Psychology should focus on how the mind helps us adapt to our environment.
The truth is rarely pure and never simple.
司马牛问君子。孔子说：“君子不忧不惧。”问：“不忧不惧，就能叫做君子吗？”孔子说：“问心无愧，何来忧惧？”