如果你的梦想没有吓到你，那它们就太小了。
当你停止追求进步的那一刻，就是你开始死亡的那一刻。
Success comes from focusing on the long-term, not just short-term gains.
The best way to learn econometrics is by doing—working with real data and real problems.
Coal mining is a partnership between the earth and human ingenuity.