种荆棘会得到刺，种桃李会得到树荫。比喻善恶有报

面对挑战时不要害怕失败，每一次失败都是通往成功的阶梯。

股市是一个将钱从急躁的人转移到耐心的人的工具。

系统的稳定性取决于开环传递函数在复平面上的行为。

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.