投资更清洁的煤炭技术是对能源未来的投资。
译文：看见合适的时机，立即行动，不要整天只知道等待。
The existence of the natural world is the same kind of fact as the existence of any proposition.
离别的时刻已经到来，我们分道扬镳，我死去，你活着。这两种哪个更好只有神知道。
一切事物都是无常的，都是生灭变化的法则；当生灭停止，达到寂静，这才是真正的快乐。
The habit of reading is the only enjoyment in which there is no alloy; it lasts when all other pleasures fade.
The ruling ideas of each age have ever been the ideas of its ruling class.
Sustainability is not an option, it's a responsibility.