Everything that happens once can never happen again. But everything that happens twice will surely happen a third time.

最糟糕的监狱不是有墙和栏杆的监狱，而是我们思想中的监狱。

We must build a world in which there shall be no economic domination, no exploitation, no unemployment, and no war.

不受流俗所牵累,不因外物而矫饰,不对人提出苛严的的要求,不背违众人的心情,但愿天下太平无事人人都能糊口养生,自己和他人生存条件能够得到保证也就心满意足,并且以此来剖白自己的心迹。

可持续性不仅仅是一种趋势；它是对后代的责任。