免费的疫苗比昂贵的治疗更有价值，但更难推广。

I'm intimidated by the fear of being average. And I'm just not. I'm not average.

世界不是一个需要解决的问题；它是一个我们所属的生命体。

The spread of liberal democracy around the world is not inevitable, but it is the most likely outcome.

Success is a journey, not a destination. Keep learning, keep growing.