你不能希望在不改善个人的情况下建立一个更好的世界。为此，我们每个人都必须为自己的改进而努力，同时也要为全人类承担共同的责任，我们的特殊职责是帮助那些我们认为我们最有用的那些人。
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.
The hardest thing to explain is the glaringly evident which everybody had decided not to see.
Sustainability is not an option; it's a responsibility we owe to future generations.
如果你想拥有从未拥有的东西，就必须愿意做从未做过的事。
是人类而非自然发起行动，但自然在很大程度上控制着结果。