The worth of a psychological theory is measured by its usefulness.

领导力在于因为你的存在而使他人变得更好，并确保在你不在时这种影响依然存在。

The future of liberal democracy depends on its ability to reform itself and address the legitimate grievances of those who feel left behind by globalization and technological change.

种树的最佳时间是20年前，其次是现在。