But I do not recognize the right to waste them, nor to rob -- by wasteful use -- the generations that come after us."

VOA: special.2010.08.12

But to do that is I recognize not without dangers often severe dangers of its own.

但一旦这么做，我要坦言，不是没有风险,通常还会是来自其本身的巨大风险。

耶鲁公开课 - 政治哲学导论课程节选