The only real mistake is the one from which we learn nothing.

再多一点坚持，再多一点努力，看似无望的失败可能会变成辉煌的成功。

领导力就是在最重要的时候做出艰难的决定。

最优财政政策要求税率随时间平稳变化，仅对政府支出的永久性变化作出反应。

We have a responsibility, every one of us. We may think we live a long way from the oceans, but we don't. What we actually do here, has a direct effect on the oceans—and what the oceans do then reflects back on us.