过去无法改变，但未来可以。现在如何生活，将塑造未来。

你无法改变过去，但你可以塑造未来。

At the end of the day it's not about what you have or even what you've accomplished... it's about who you've lifted up, who you've made better. It's about what you've given back.

模型最重要的不是其假设，而是其结论。