领导力在于做出艰难的决定，而不仅仅是受欢迎的决定。
Leadership is about making tough decisions, not just popular ones.
I must study politics and war that my sons may have liberty to study mathematics and philosophy.
Innovation is not just about technology; it's about changing the way people think and live.
德行与邪恶两个名词乃是以集体为对象的概念，是只有通过人们的频繁接触才能产生的。
Optimism is a learned skill. Once you learn it, you can improve your life in every way.
The coal sector must adapt to global energy transitions while maintaining efficiency.