孔子说：“对品德不进行培养，对学问不进行钻研，听到好人好事不能跟着做，有了错误不能及时改正，这就是我所担忧的。”

2001：贝索斯致股东信《我们始终坚持现金流为王》

"The only limit to our realization of tomorrow is our doubts of today."

I think it's very important to have a feedback loop, where you're constantly thinking about what you've done and how you could be doing it better.

反复练习是儿童的智力体操。

教育者的心必须是一团活生生的火焰，是温暖和光明的源泉。