我是那种人，如果你问我一个问题而我不知道答案，我会告诉你我不知道。但我敢打赌，我知道如何找到答案，而且我会找到答案。
Freedom and responsibility are inseparable.
The whole conviction of my life now rests upon the belief that loneliness, far from being a rare and curious phenomenon, peculiar to myself and to a few other solitary men, is the central and inevitable fact of human existence.
Modern forestry must balance three axes: ecology, economy and ethics.
可持续性不是一种趋势，而是我们共同的责任。