伟大不是环境的结果。事实证明，伟大在很大程度上是一种有意识的选择。

The great powers are always searching for opportunities to gain power at the expense of their rivals, which makes them inherently aggressive.

Time is your most valuable asset—don’t waste it on things that don’t matter.

实现明天的唯一限制是我们今天的疑虑。