Freedom is not merely the opportunity to do as one pleases; neither is it merely the opportunity to choose between set alternatives. Freedom is, first of all, the chance to formulate the available choices, to argue over them - and then, the opportunity to choose.

勇气不是没有恐惧，而是战胜恐惧。

可持续发展不仅仅是一种趋势，而是我们对后代的责任。