晏子春秋

有时候要大胆，有时候要小心，一个聪明人知道什么时候该怎么做。

The ability to associate depends, in turn, on the degree to which communities share norms and values and are able to subordinate individual interests to those of larger groups.

In the end, it is not the years in your life that count, but the life in your years.

数学中发现的快乐是无与伦比的。