阈限性是两个阶段之间的过渡状态，个体既不属于这里也不属于那里，处于两者之间。

世界上最危险的事情是试图分两次跨越鸿沟。

I can never be safe; I always try and go against the grain. As soon as I accomplish one thing, I just set a higher goal. That’s how I’ve gotten to where I am.

Never stop learning—the moment you think you know everything is the moment you start falling behind.

Investing in people is the most valuable investment a company can make.

Your most unhappy customers are your greatest source of learning.