出自北齐·颜之推《颜氏家训·勉学》。不得，不能、不可。雌黄，矿物名，可作颜料，古代用以涂改文字，后引申为信口更改、随便乱说。没有读够一定数量的书，对前人的见解没有彻底了解，是不能随便乱下结论、乱发议论的。书要多读、话要谨慎；应当谦虚向学，不可妄自尊大。

"Always be learning. The world is constantly changing, and you need to keep up."

大海不会奖赏那些过于焦虑、贪婪或急躁的人。

没有人是自由的，甚至连鸟儿都被天空束缚。

"I'm not afraid of storms, for I'm learning how to sail my ship."

We've had three big ideas at Amazon that we've stuck with for 18 years， and they're the reason we're successful:Put the customer first. Invent. And be patient.

Success is not final, failure is not fatal: it is the courage to continue that counts.

成功不仅仅是赚钱，而是有所作为。