Challenges are opportunities in disguise.

出自《论语·先进篇第十一》。子路问孔子说：“我大胆的请教您，死是怎么回事呢？”孔子回答说：“还不知道生是怎么一回事，怎么能够知道死亡呢？”

It's not about being perfect, it's about being better than you were yesterday.

我不与任何人竞争，我只与自己竞争。

网球是一项残酷的运动。没有平局。如果你输了，你就出局了。