The only time you should ever look back is to see how far you've come.

"The task of the modern educator is not to cut down jungles, but to irrigate deserts."

给自己倒一杯饮料，涂上口红，振作起来。

释义：有了过错却不知道的人是被蒙蔽，迷失了方向还不返回的人是迷惑。这是对自知之明与迷途知返重要性的阐述。