What's terrible is to pretend that second-rate is first-rate. To pretend that you don't need love when you do; or you like your work when you know quite well you're capable of better.

数学教会我们逻辑思考并系统地处理问题。

I believe it's important to have a passion for what you do. If you don't have a passion, you won't have the energy to keep going when things get tough.