领导力意味着即使不受欢迎也要做出艰难的决定。

千丈长堤，可能因为蝼蚁的洞穴而溃决；百尺高楼，可能因为烟囱的缝隙冒烟而焚毁。

数学的美在于它简化复杂问题的能力。

No matter what he does, every person on earth plays a central role in the history of the world. And normally he doesn't know it.

要理解心灵，就跟随它的实际后果。