The art of competing, I’d learned from track, was the art of forgetting, and I now reminded myself of that fact. You must forget your limits. You must forget your doubts, your pain, your past.

如果你买进时股价过高，那么就算是买了全世界最好的公司的股票，也会变成最糟糕的投资。同理，如果你低价买进一只股票，哪怕公司基本面平平，也可能会成为你投资组合中的明星。

A 1% drop in user experience becomes a 100% disaster at scale.