人类的进步史也就是人类的堕落史；而私有制的确立，是造成人类不平等及其后果的关键。
世界不是一个需要解决的问题，而是一个需要经历的神秘。
The elevation of life is determined by the elevation of character.
The dead are not dead to us until we have forgotten them.
Learning makes a man fit company for himself.
We must balance the need for energy today with the imperative of protecting the planet for tomorrow.
