最大的悲剧不是我们预见的那些，而是我们从未预料到的那些。

可持续性不是一种选择；它是我们星球未来的必需品。

You cannot hope to build a better world without improving the individuals. To that end, each of us must work for our own improvement and, at the same time, share a general responsibility for all humanity, our particular duty being to aid those to whom we think we can be most useful.