The only thing we can know is that we know nothing and that is the highest flight of human wisdom.

【讲解】：在实行仁德之事的时候对自己的老师也不要谦让。

"Weonly live once, Snoopy.""Wrong. We only die once. We live every day."

生存下来的不是最强壮的物种，也不是最聪明的物种，而是对变化反应最迅速的物种。