做一个有道德的人，就是要付出、必须付出某种关注。
To be a moral human being is to pay, be obliged to pay, certain kinds of attention.
可持续性不是一种选择，而是我们对后代的责任。
The world owes all its onward impulses to men ill at ease. The happy man inevitably confines himself within ancient limits.
问题的解决不是机械地应用过去的经验，而是通过重构情境来实现。