"To be human is to be flawed, and to be flawed is to be real."

我认为你不能比较网球的不同时代。每个时代都有其伟大的球员。

The ability to imagine counterfactuals is what distinguishes humans from machines.

The best way of learning about anything is by doing.

Never use a credit card for credit. The only kind of credit， or debt， that is acceptable is debt to acquire something whose exchange value is extremely likely to increase， like in a home. The exchange value of most things diminishes or vanishes the moment you purchase them. Don’t be in debt to losers.