如果战略达到了目标，它就是有用的；如果战略实现了目标，它就是成功的。

I touched the pain in my chest. It was the place where she had one or two times in my hair.

数学的力量在于它的抽象性，使我们能够看到不立即显现的模式和联系。

在数学中，发现的旅程往往比目的地本身更有价值。

You see, in life, lots of people know what to do, but few people actually do what they know. Knowing is not enough! You must take action.